turnigy 9x stick malfunction

[CentralOregon]

the right stick in the front to back motion quit working - no responce from servo connected to that channel - side to side still works and left stick still works - changed out servo- switched modes - anybody else have this problem?- anu ideas??

[RCModelReviews]

Could be either a faulty pot, faulty wiring to the pot or a faulty microcontroller.

Start by checking the wiring to that stick unit -- make sure the soldered joints look good and that the connector which is on the other end of those wires is firmly pressed into the circuit board.