As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: PILOT REPORTS AFTER LANDING STAB TRIM RAN UNCOMMANDED CONTINUALLY IN BOTH DIRECTIONS. TURNED OFF BOTH STAB TRIM PEDESTAL SWITCHES, STOPPED STARTED AGAIN WITH BOTH SWITCHES ON. MAINTENANCE PERFORMED TASK 27-41-00-810-804 AND GOUND NO FAULT THEN PERFORMED SURFACE TEST ON DFCS STAB TRIM AND NO FAULTS PRESENT. A/C OKAY FOR SERVICE.