I have thoroughly de-oxited switches and pots and replaced all electrolytics. Once in a while though, the RH channel will drop out temporarily and last night it kind of faded out slowly. But then the channel popped back after 15 sec or so. It seems to happen when the amp is first started up and then gets better after warm-up, but it hasn't happened enough to say for sure and once I just disconnected it and went through the M2 directly from my DAC. So I know it's not the M2. I realize this is a complex preamp and it could be anything. But just wanted to ask before I dig in. Is this perhaps a common issues with Yamaha preamps? Is there a recommended faulty transistor or relay that I should have replaced in addition to the recap? I don't think I experienced this before the recap, but I didn't have it long before recapping either. TIA !