As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED F/O STAB TRIM WOULD NOT TRIM DOWN IN FLIGHT AND PROBLEM SEEMED TO BE INTERMITTENT. CAPTAIN’S SIDE WORKED FINE. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, R & R F/O PITCH TRIM SWITCH AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.