Pioneer XRP640 Fault

Hi All, i have this bloody unit in for repair with the following fault. It had FU2 fuse blown. Traced it back to the output board and found D7526 S/C. Replaced but fault remained.Checked all components and all rest ok.This unit has 2 boards with a fan in between.Regulation board is ok unit works with output board disconnected. I cannot find cause of this fuse blowing .Has anyone seen this before or has any suggestions. Cheers Joe

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valiumboy
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