Have tried to get support from Harman for this issue and it seems like even they don't have a good breakdown of parts for these Crown amps. I explained the problem to the support rep on the phone and told him I was pretty sure I need the actual electrical part of the power switch that is soldered in. He seemed to understand somewhat but couldn't view an exploded drawing for some reason. He said he was fairly certain he had the correct part and sent me the long internal plastic pushrod which connects the front button to the switch itself. Seriously? Has anyone else had to perform this repair? Have a good part# ? Any information would be helpful. I have not actually taken the amp apart just yet, but spoke to a very reputable amp tech locally and he said he's had to replace them before and it has been the electrical switch. I am so frustrated for the lack of support on such a high end unit. What do large touring outfits do if they need a part while on tour? I waited over a week for this thing to be shipped first class mail, just to receive the wrong part.