Sold sampler with issues, buyer wants to return it about a month later - feels a bit fishy
Long post but I just wanna cover everything, I sold my SP-303 and it had a messed up power jack so it wouldn't turn on sometimes, but when it would it still worked perfectly. I never had any audio glitches or dropouts, or any memory issues, and I found an old thread on SP forums where someone had the same problem but they fixed it by reheating the solder on the power jack because it sometimes gets worn on older gear. I tried that and it worked great for a while, but it started acting up again so I mentioned that to the buyer before I even packed it and said they might need to have it re-soldered altogether, which they said was fine. This was almost a month ago, and they messaged me last week saying they brought it to a tech who said the processor was bad, and that it might not be fixable, then they just messaged me again yesterday saying that their tech can't fix it.
They're saying the power supply was wrong and it fried the processor, the 303 needs 1000mA and the power supply I got with it was supposedly only 500mA but the voltage was right (I had it for years without any issues, the input issue only started after it had been sitting unused for about a year). I'm not an expert on this stuff but I'm honestly kind of skeptical (especially since everything on the sampler still worked when I could get the power jack working, and it ran perfectly when I reheated the solder again, so if the processor really was fried I'm guessing it would've had more problems) but I still feel kinda bad if they're being honest. I also looked it up and it said that if the amperage on a power supply is too low then it'd more likely cause the power supply to overheat and fail, break, or cause random shutdowns, than it would be to damage anything on the sampler itself (I'm guessing it's still a risk, but it didn't seem too likely from what I read - plus there's always a chance that their tech messed something up, especially after they've had it for this long). They also sent me the name and phone number of the tech they went to (and the company name) which is a little fishy IMO, I looked it up and it's a real place, but still. I asked a few friends who have more experience with electronics and they said that'd basically be impossible for it to fry the processor, and I even stooped to asking AI and it said the same thing (I checked its sources and I even tried it again while posing as the buyer, and it still said this pretty much just couldn't happen).
I'm still skeptical because if the processor was fried then why was everything working whenever I was able to get it turned on, and why did reheating the solder like the thread said seem to fix it if the processor was fried? Wouldn't it have had more issues I would've noticed? I took a demo video of me testing all the inputs, knobs, pads, and effects, and everything worked how it should, and tested it again while taking a video of me packing the order.
Reverb support said it's up to me whether I want to accept a return or do a partial refund since it's out of the 7 day window (the support agent I talked to also got back to me saying he offered some form of accommodation for the buyer so that I don't need to do any sort of refund, but the buyer hasn't said anything about it yet and I'm not sure what the accommodation is), but I don't really know what to do here.
Today support said the buyer still hasn't responded, I messaged them last night saying that support would be handling this and sending some sort of accommodation for the order, but they just responded without mentioning that and instead just asked when I'm paying them back, and that they're fine with me making payments until it's fully refunded (no mention of returning it either). I'd still feel bad if they're being honest, but I'm just a bit thrown off by all this and things just keep seeming fishy IMO. Sorry for the long post, thanks for any help
Update: He said he denied support's offer, it was apparently just $50 as compensation, now he's asking for a timeline on when I can fully refund him.
Update 2: the support agent who's been helping with this said he upgraded the support request to the team who handles reverb protection cases, so I just gotta wait and see what they say now. I'm guessing/hoping I'll still be fine, since this whole thing does feel a bit fishy, but I don't really know what to think at this point lol also I'm even more put off by all this because I included extra memory cards and a USB power supply (myVolts Ripcord) so even if I was gonna do a refund it wouldn't be a full one