Montage 7 keys not playing at the ends only the middle

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1

I Have a yamaha montage 7 after a power outage the low keys stop playing for the low circuit bourd and about 5 key on the hight end. Any assistance on hiw to deal with . Thanks

2

Any water damage? Have you checked the boards for any damage?

Service manual is available at Client Challenge

3

No visible water damage. Meet a few small flying insects died inside .