You might want to try swapping stuff around to see if the gimbal is the problem or if it is something else. A couple of things you could try:
- Some ST16's had enough wire so you could just swap the connectors on the right-hand gimbal (Left-hand side when looking from the back) to see if the problem shifts to J3.
- IF swapping the two wires on the same gimbal won't work, it's not real hard to swap the entire left and right gimbals to see if the problem shifts to J2.
Probably cheaper to replace than repair. If you've tried all the tricks and are not sure what is at fault, it becomes something of a gamble to either replace the right-side gimbal, the main board or send it for repair.