As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE REPORTED A DUAL PITCH TRIM FAIL ON LANDING AND TWICE ENROUTE PITCH TRIM 1 AND 2 INOPERATIVE. MESSAGE APPEARED FOR 5 SECONDS EACH TIME, THEN WENT OUT. REPLACED HSCU IAW MFG MM. OPERATIONAL CHECK GOOD. AC RETURNED TO SERVICE. (SW21200406973)