Roland FP-10 with water damage

Hello, I have a fairly new (less than 2 years) Roland FP-10 keyboard. Apparently it got water damage on the high notes circuit board without my knowledge. At first only those keys acted up but then all the keys started acting up/playing wonky sounds. The shop I bought it from does not replace parts, only the whole interior which is basically the same price as new.

What are the chances it would work again if I only replaced the high note circuit board? Or would I need to replace all 3 since all the notes were going crazy?

Thanks.

There’s a good chance it will work if cleaned up.

Otherwise, if all the other notes are fine, then yes, a replacement part should fix it.

Do you have a photo of the damage?