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Technics sx-KN7000 keyboard - missing, weak sound effects

Technics KN7000 kybd,      missing & weak brushs, cymbals, some sound effects, some high freq instruments weak or missing, all factory scans test ok,  I am a tech , suspect bad caps but where? Some instrument sounds maybe a little lower in volume , I dont know which board may be suspect, any help would be appreciated 👍👍 I have the service manual from elektrotanya 💪. Thanks 
Cliff