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Good memories of the days when I worked on those. Haven't seen one around here for years.
The yoke is an easy check...a yoke ringer will send test pulses into it, and if the pulse continues to "ring" for a little while the yoke is almost certainly good. I think just about any TV shop that worked on CRT sets has one. I don't remember ever seeing a bad yoke on one of those. I do remember replacing lots of triplers though. I think this set also has a square focus resistor behind the tripler. I replaced a lot of those too, but they usually cracked open and hissed and snapped up a storm.
Did the repairman use a high voltage meter to see what was going to the picture tube?
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