As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3535, DURING CLIMB-OUT PITCH TRIM MAIN INOPERATIVE WARNING MESSAGE BACK UP TRIM WORKED. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED HSCU IAW AMM 27-40-00 ALL TESTS OK PITCH TRIM ALL TESTS OK. AIRCRAFT RETURN TO SERVICE.