As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4366 - CREW REPORTED A PITCH TRIM 1 INOPERATIVE MESSAGE ON EICAS AND BOTH MAIN SWITCHES INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE HORIZONTAL STABILIZER CONTROL UNIT IAW EMB MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)