I think you might have found it!! Not much else it could be!!
Well I thought I had it. As soon as I powered it up it looked pretty close to perfect. Powered it off and turned it on after a couple minutes and then it was way off again lol. So I started playing with switches again well I switched the selector switch back and forth and it came back perfectly. I have cleaned that thing three times now and would think it would be good. Maybe I should use hydrochloric acid haha.
Dan