I worked as an electronics restoration tech for many years. I saved a smoke-damaged M500 from a fire, meticulously cleaning it with pressurized DI water and surfactant. I used the amp for years until one day my wife's friend plugged a 3.5mm adapter from the input directly into her phone, cooking the right rail as the phono jack shorted. I fixed the first stage, but as the current came up it cooked again. Greg fixed my baby, making it better than ever. This amp means more to me than any other physical possession. Just do the MKII service--it's cheaper than buying many consumer recei