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Pioneer EX-9000 dynamic expander svc manual request

Hello i'm in search of the pioneer dynamic range expander EX-9000 service manual.

This item seems to be built with all analog components (op-amps and discrete)
and i need to repair it.

It has one channel going mute or very low output with cracking sound at an impredictable time after power-on. I have considered the temperature but it's not a factor. I suspect a leaking capacitor but due to the sheer number of those i need the schematic to follow the signal path.