I have a Technics SA-404 receiver and I love it BUT the power transformer gets very hot after 30 minutes of operation at 1/4 volume. I need help as to what to do. My first thought was to put a cooling fan on it but I don't want to bandage it and ignore the cause of the problem. Besides the heat I get a slight odor of "burned electronics". I know that should be a red flag. How do I go about diagnosing the issue? I have a service manual and I 'm handy with a VOM. My thought is to find a replacement power transformer but I would like some input from a brain more full than mine please.