Casio FZ Samplers

Hi,

i have a problem with one of my Casio FZ10m. One has a noisy headphone output the other not. It comes from the Outputboard. If i switch this board from one to the other the noise moves with the board. But i cant find the problem, as i dont have a schematic to this Board. Maybe one of you guys had similar problems and solved it?

dirty relay contacts? 
old cap/resistor?
blown opamp?

Charles

is there an Omron one , ?  I just listed
parts which are common faults....
wish I was there ,   is it a hummm    a
static    or a snow sound?