As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRIC TRIM DID NOT WORK INFLIGHT FROM F/O OR CAPTAIN SIDE, AUTOPILOT TRIM DID WORK. RAN QRH AND RETURNED. PERFORMED FIM TASK 27-41-00-810-804 AND AMM TASK 27-41-00-700 -805. STAB TRIM CHECKED GOOD. R & R STAB TRIM CONTROL RELAY (R64) AS PRECAUTION. SYS OPS CHECKED GOOD.