u/Glum-Efficiency-4374

I recently acquired this Yamaha DX 100.

After giving it a good clean and replacing the battery I have lost control of a few notes in the upper range of the keyboard.

The image shows the notes that are working which are black notes and the rest of the keyboard.

The keys with crosses are the white notes and none of them are working in this range.

I have cleaned the contacts with alcohol cleaned the rubber with alcohol.

Checked all the ribbon traces. They’re all good. Sockets are good.

So outside of getting conductive paint to paint onto the rubber membrane.

All notes appliable via midi.

I’m wondering if anyone else has any thoughts or suggestions?