Panasonic TV model CT32X31E shuts off whenever it wants to

This set is driving me nuts. The customer says that for the past 2 or 3 months the set would just shut off sometimes. He found that he could not turn it on again unless he unplugged it for a few seconds. Finally it quit completely. I found the 6.3A line fuse open, but it wasn't blackened like it would be from a dead short. This fuse had a minute break in it. I have seen this happen before where there was no apparent reason. I checked for any obvious shorts ans I found none. I then touched up any suspicious soldering (although I didn't really see anything suspicious), and I replaced the fuse with a 4.0 amp because the 6.3's were in the van and thats what I had nearby. The set came on looked great and the fuse has held up fine, however three times during the course of 2 hours the set has shut down for no reason. I haven't seen it actually happen so I have no specifics to share. I try to power up again and just like the customer said, it does nothing until you pull the plug for a few seconds and then retry. Set comes back on and again plays for an undetermined amount of time before it decides to once again shut down. I have no schematic for this thing and I was wondering if anyone might have any information on this symptom relating to this model? Or might someone perhaps have a schematic for this chassis that they could share with me? Thanks very much for any assistance. Lenny Stein, Barlen Electronics