Does anyone know if it is worth my while to sell my Harmon Kardon AVR 500 if the subwoofer output isn't working? I used it up until yesterday. For some reason all channels are fine but I get no sub output. I have a new sub and am getting a new receiver. Electonics shop said guestimate to repair any multi channel receiver is $225-$275.00. I thought about listing it on Ebay. Will it sell?