Hi CessnaFlyer, I just came across your post, about a year ago I had a similar problem. I traced the fault to the wire bundle at the end of the yoke tube. Because over time these wire are both pulled and pushed some of them had broken, I separated the broken ones one by one (several are the same colour) and identified them with masking tape labels, then I solder repaired them. There is sufficient play in the bundle to reinforce the break using tape without compromising the operation of the yoke.
Maybe this is the problem you have? I hope it helps anyway.
Beers
mog