I'm looking at a pair of them on eBay and they are described as non-functional, having the fault lights on. I have some experience with older amps like Phase Linear 200, 400, 700 series, SAE stuff from the 70s and Marantz amps of the same vintage but I have never worked on newer amps like the Crown CE series. Are these "throw away" amps or is it worth it to sink a few hundred into these if they are repairable?