TV shuts down. The set will come on, then picture will start pulling in on the right side, then

Question

The set will come on, then picture will start pulling in on the right side, then shut down in about 20 minutes. I had a similar problem with it about a year ago and found a service letter saying to replace the 2455 capacitor. I did this and unit has worked fine until now. I thought my solder joint may have come loose, so I resoldered it but no luck. I am a very experienced mechanic but a novice on televisions. Any help would be appreciated.