Hi all, just in the process of working on a friends 777 that had a few issues but is now running perfect except one thing. I've repaired the power switch, changed the belts and cleaned the idler wheels, secured one of the tape heads as both screw were loose - now secure and adjusted and playing great. A thorough cleaning of all pots/record bar etc but the left channel is still very low on line in. If I turn the balance control all the way to the left you can hear it at a very low level, it was like this on both sides before I started so I've got the right channel to work. Tape and radio both play loud and clear through both channels. I've cleaned the plugs with deoxit and left to dry overnight but still no better.