Ele. diagram of Pioneer amp A-91D, help me!!!

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Hi, I bought an used integrate amplifier PIONEER A-91D in a perfect cosmetic condition but when I listen it after half hour I can hear that the sound change and it isn't more clean and powerfull as before!
I think that one problem is the capacitors because it has a lot years and doesn't work since 3 years.
Now a Pioneer service (in Italy) cannot find the electrical digram and so he cannot fix up it (repair) so I'd like ask to all if possible find the electrical diagram of this amp.
Can you find it?
thanks so much.

William.:hot:
 
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