The model is a 27G22V, the chassis is APEDP280.
This set has had an intermittent vertical collapse/instability problem for
some time.
This only shows up cold. After 5 minutes it is stable and stays that way
until it is cold again.
It has been pretty consistent in always showing the problem.
A slight bump on the case will generally eliminate the problem for the
session.

I finally got a neighbor to help pull it out of the entertainment center.

I have been looking for a bad solder joint or other bit of flakiness.
Nothing shows up visually. I have inspected most of the solder side with a
magnifier. I have jiggled the leads going to the yoke. I have used an old
aligning tool to push, poke, prod and otherwise try to replicate the
problem.
Of course, everything works without a hitch

Since I have not had the need to get into the innards of a set since the
days of hybrids, I don't recognize circuits by their layout and component
mix. What is being used for the vertical amp/output device? I don't have a
cold spray and the heat gun seems like it is going the wrong way

Suggestions are solicited on what might be next. I hate to just button it up
and put it back without resolution.

Charlie

The first TV I ever worked on was a 7" Dumont that had a brute force HV
supply and electrostatic deflection.
..