Kawai ES4 amplifier

Hello all in the collective,
Question is specifically for Kawai ES4.
It seems that the Amp/Power supply is not working. Any recommendations on repair or replacement?
Have connected with Instrumental Parts, no response. Guessing they do not have part available.
To validate symptoms. Power up and all the various buttons function as well as Demo going through it’s normal cycles. Just no sound through speakers. Have checked all the in and out boards as well as traced all solder connections thus going with Amp board.
Thanks in advance for any assistance. cG