Fan replacement for DS923+
One of the fans in my DS923+ started rattling (regardless of RPM). Tried cleaning it but it didn't fix anything.
So I'm looking for a replacement. Where can I find OEM fans for this model?
Or should I go with Noctua NF-B9 redux-1600 fans and swap them both? Are there any issues I should be aware of if I install the Noctua fans?