Yamaha PSR225GME keyboard issue

I have and issue with F#4 and G4 keys, they are both dead. According to the wiring
diagram they have a shared lead on the keyboard matrix. I notices ther are options
related to keyboard contacts. Any recommendations would help.

With any dead keys, I always want to check the contacts first. Sometimes it just takes a bit of cleaning.

Do NOT use any solvent on the rubber contacts.

Thanks for youor response. Finally had an opportunity open it and see the problem.
It’s corrosion on the contact circuit board. I see Syntaur offers a board. Appears to be an easy enough fix.I’ll follow up.

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