Welcome...lots of good folks around here. There are a handful of guys helping me as I try to refurb my TFM-35X amp, and they've been more than helpful. They aren't kidding about the picture thing either...the more pics you can supply, the more helpful they can be. When you get ready to tackle your C4000, I'd recommend starting a dedicated thread and let them work their magic. Or I guess at least help you work yours.