1976 Zenith CCII

[radioguy13]

Good evening ! I am having a problem with a with a CCII with a 19HC48 chassis,
I picked this set up from a ewaste run a high school was doing due to the fact that it was in perfect condition and when I brought it home it worked like a champ !! with great sound and vivid color allthough the focus could use a touch up but here is the problem that just showed its ugly head the other night.
When the set is running it looks great but after about 2 to 3 hours of running it will trip the breaker and shut off, did this last night so today I reset the breaker and all was good again for a few hours, did not notice any smell there is no hum in the picture or sound indicating a bad filter and when touching the filter cap its cool to the touch BUT the power trans after an hour or so is cooking HOT !! measured with IR thermometer and after an hour was at 152 F is this normal or do I have a primary winding short ?? what do you guys think ?? if so is this worth saving or parting out ??
thanks Kenny