As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT PITCH TRIM WHEEL HAS SPIRAL GROOVE THAT INDICATOR RIDES IN TO DISPLAY PITCH TRIM POSITION. WHEEL TRACK BROKE AND ALLOWED FOD TO INHIBIT WHEEL MOVEMENT DUE TO BEING JAMMED WITH INDICATOR. INDICATOR JUMPED TRACKS AND GAVE ERRONEOUS INDICATION TO CREW RESULTING IN LOSS OF FULL PITCH TRIM TAB MOVEMENT.