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Okay, I've come up with an easy solution.
They only used one side of the pot, the side without the stop, circuit is hooked to the center tap, outer leg was hooked to ground through a 1k resistor.
I moved the resistor to the other outer leg and it worked but without enough range, then I realized that was the side with the 1k stop, so with the resistor it was 2k, took the resistor out and hooked the leg directly to the chassis and it works fine, the bad spot is outside the area needed to get the linearity right, the control works backwards of course but that's a minor issue.
The vertical controls have extenders on them so they stick out the back, accessible to the user, possibly there was a vertical issue at some point, or they were just obsessive about getting the picture perfect and they wore out the pot fiddling with it?
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