Recently picked up a C-70 per-amplifier in pretty beat up shape cosmetically. It did power up and that's as far as i got to test it. I've cleaned it up inside and out with compressed air and sanded, primed and painted outside covers with some black automotive paint and now looks very nice. On to testing it. Right channel is very weak in all sources. Para tone control on or off right channel very weak. looks like some glue near the power supply area might be corroding some parts as I see some green slime on a couple resistors. Is this usually a cause for channels dropping? When I have time I want to pull out that board and give a good once over but thought I would ask the experts who have seen this before.