Question about Harman Kardon AVR-630 7.1 Channels Receiver

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Hello my reciever has a problem with the mian

Hello my reciever has a problem with the mian front channels (l+r). I just hear crackling and static. The other channels are all ok. This started as an intermitant problem but now it seems permanent. Is there a relay(s) that connect these channels whos contacts have gotten worn out? please advise or provide schematic / part no. If possible. thanks tis

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