My M-504 powers up but never gets past the protection relay. Here's what I know: D411, 412 and 418 glow in the dark. DC bias is 17mV and 9mV (spec is 15mV). I powered up just long enough to take a quick look at things and shut her back down. I'd appreciate any help with the next steps in fault isolation. I have the service manual but now have to figure out how to reduce the pdf file size to post.