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HI,I have a schematic if thats any help dont know if it is a full schematic but I found it in my service docs on my network. I am afraid I cannot suggest what it could be you might have to test everything with a meter. Have you done any voltage measurements to check all the volt rails are up and correct.
Hi sorry been off ill.Cheers for getting back to me.Ive checked the thermistors and there fine,dry joints been over the entire board.Ive rebiased and checked all transistors.The protect light comes straight on,But if I chop onside of D318 the amp comes on both sides work.Got me stumped