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( Please click on high lighted words) this is my sample may not be the same model but doesn't matter the technology is the same
Normally the parts for this unit is a kit Y-SUSTAINBOARD and Z-SUSTAIN BOARD, this is what most manufacturers would want you to do, purchase them. But go to high lighted words and go through all the voltage checks to find the bad part, here is also a chart that should help a lot
I hope my efforts are appreciated
Good luck friend