As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4120 - DURING CLIMB AT 245 KNOTS AND 10200 MSL, THE PITCH TRIM ONE WAS INOPERATIVE ON EICAS. PITCH TRIM WOULD NOT RESPOND TO CAPTAIN, FIRST OFFICERS, OR BACK UP COMMANDS. AIRCRAFT WAS LANDED SAFELY. MAINTENANCE REMOVED AND REPLACED HORIZONTAL STABILIZER CONTROL UNIT IAW MB MM. CMC AND DFDR WERE ALSO DOWNLOADED. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)