RP1 multieffect - left output is suddenly dumb, what's up?

Hi, I'm lookin'for service manual, because my RP1 is an "half invalid", the right output is still working, but the left one (and mono) stayed suddenly dumb..! Knows anybody what s goin' on..? I own this gembox over 20 years and till yesterday ain't got no any problem with it. Help..! Thanx, JayTee.

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