I just recently bought this thing on Craigslist for $20 plus a couple hours windshield time. It looked a little rough, was very dirty inside and was missing pre/main jumpers and a fuse between transformer 2 and the sub rectifier board. I blew the inside out and lightly brushed everything off with a small soft paintbrush and replaced what was missing and then checked my DC offsets and was 4-5 mv on one channel and 8 mv on the other channel so I put some speakers to it. Everything was good for a week until today. Fired it up and let it sit a few minutes and hit speaker 1 and with no source playing I heard a noise like a mix between a humming and static coming from the left channel and pretty quickly turned it off. I pulled it out and checked the DC at the speaker terminals and the right channel was where it was last week but now the left channel is at 5V DC on start up and then climbs to 8 and then settles back down around 5-6V. I'm pretty ignorant with electronics so this may be out of my league and I won't be out much if it is but does anyone have an idea what might have happened and is there anything someone could walk me through to try and check and possibly repair this thing? Any and all help is greatly appreciated in advance.