Does anyone have experience with selling on ebay? My husband sold an amp in working condition (we did a large test run prior to listing). And we mailed it to the person who won the auction. Now he is saying the amp is flaky. My husband thinks perhaps a wire got loose during shipping. My husband explained some basic diagnostic testing and offered to mail the USPS insurance receipts to him so he can get it fixed and bill USPS for the repair or get the price of the amp he paid back. What else are we supposed to do? We said no returns just because it is such a large item and cost almost 1/5 of the item to ship.