I was wondering if I could replace the input gain and output level pots myself without having to drain the capacitors? The pots on my Quatra need to be replaced and I have the soldering skills to do so. The pots are mounted to the chassis and not on a PCB. The caps are towards the rear of the amp. Can I do this without killing myself? I was planning on sending it in to British Audio Service but for the cost of shipping and the parts and service it just really wouldn't be worth it for two pots. Thanks.