I dont want to post bad info. I was up until 2am last night and I thought I had it licked before I went to bed.
I just powered up the scope and when I switch from channel one to channel two it is back in add mode. After about 20-30 sec this clears up and it works normally.
Could it be that it was in fact the capacitor that was at fault and the 1kv substitute is not responding as quickly as the 150v?
I want this scope to work perfectly. Its a very nice and clean scope.
Working on these scopes is like working on a classic car both rewarding and frustrating!
Timothy