As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING OUT OF FL390, PITCH TRIM ANNUNCIATOR ILLUMINATED. FOLLOWED CHECKLIST, TURNED OFF AUTOPILOT. UNABLE TO TRIM ACFT USING MANUAL & ELEC PITCH TRIM. WENT TO LOWER ALTITUDE 12,000 FEET & MANUAL & ELEC PITCH TRIM & AUTOPILOT OPERATED NORMAL. LANDING WAS UNEVENTFUL. LUBED THE PITCH TRIM ACTUATORS & PERFORMED SEVERAL SUCCESSFUL FUNCTIONAL CHECKS OF THE PITCH TRIM SYS. ACFT WAS RTS.