[VA561]

Hello Everyone
I seem to be having a color sync issue with my Wescott. Sometimes I turn the set on and I have a great picture, no problems. Sometimes I turn the set on and no color sync. Then about 10-15 minutes later everything is fine again. On occasion I will watch the set for an hour with a great picture and then all of a sudden no color sync. Its a random occurrence. Need to know where the adjustment would be on the chassis to correct this problem. Last picture is when everything is fine.