Decided to put a couple more hours on the set tonight, and the result was the same.....light retrace. The picture started out jittery, but stabilized after about 10 minutes of play.
In the automotive field, there's some points in time where you have to allow the component to fail, to identify the root cause. Since my diagnostic skills leave something to be desired (I can spot the easy stuff), I decided to give that a try. Didn't woik
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Since there's only about a half dozen resistors on that board IIRC, I'm just going to go ahead and replace them all. I figure if you're going to take the time to desolder one end to take the resistor out of the circuit, you might as well just do the other end too and replace it......