Alpine PDX-5 service manual?

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Hi, Last year I bought this PDX-5 amplifier and didn't installed 'till yesterday. The guarantee period is way over and is not working Ok.
Channels 1 and 2 are ok but 3 and 4 are much lower in amplitude.
Down here there's no official Alpine service so I'm looking for some schematics or the service manual.
Could anybody tell me any place to ask for it? I don't mind paying for the manual if its necessary. Mind you, without it I think it's going to be difficult for me to repair this unit. I have some experience on class D amps, but an schematic would be very important.
Thanks for any leads on this.
 
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