I brought home a close to mint condition Kenwood KA-8100 a couple of days ago. The face plate is pristine, except for a very slight bent top corner on the left side. The case is close to perfect also, only a very small discoloration on the top, and that's between the grills. Anyway, I plugged it in, the power indicator flashed a couple of times then died. Tried a few more times, no go. So out come the Deoxit. Took me at least 5 tries to cure this. Now it powers up, and the relay is working. Running into another problem though. All 3 filter buttons (low, high, subsonic) are stuck in the "on" position (pushed in). When I push them, nothing happens. Looks like they have springs behind them tough. Any of you experienced this before? Is there an easy fix? I'll see if I can take some photos in my photo studio this week and share with you all.