We've just re-assembled a new FX-3 in New Zealand and the only serious problem is that the electric trim appears to be binding on each revolution with a the motor making a characteristic whir whir noise. The circuit breaker popped after takeoff on the first flight but it operated fine after that.
The jack screw is observed to be running true and the motor runs fine when detached from the yoke. Manually turning the jack screw it seems stiff in one particular segment of rotation. If the pressure is taken off the elevator however the screw turns much more freely.
Disassembly of the jack screw involves cutting a hole in the fabric so I'm less than enthusiastic about that.
Any suggestions or experiences welcome.