The thumping sound is one of the amplifiers autooscilating - this is caused by a failure of the control unit, itself most likely caused by overheating. Unfortunately there is nothing you can do, the unit must be tested to make sure the failure wasn't caused by a defective power source and the mainboard replaced. This is going to be expensive.
Get a quote before committing, it might be cheaper in the end to just get a new one.
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