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hi, ive got a harman kardon avr 507 amplifier, trouble is the front, left, right and center are ok, surround right ok, surround left not working just get a hum noise and then switches off with protect error, it only switches off when speaker is connected, at first it kept blowing the fuse, also i replaced the d2560 power transistor, for the surround left channel however it just blows the fuse again and takes out the power transistor again? all other channels fine? anyone help or please advize ? many thanks mr smith

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