As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4406 - DURING CLIMB-OUT, CREW NOTED ON EICAS PITCH TRIM 1 FAIL. NOTE YOKE SWITCHES DID NOT WORK BUT THE BACK UP TRIM DID. AIRCRAFT RETURNED TO ORD SAFELY. NO FURTHER INCIDENTS WERE REPORTED. MAINTENANCE REMOVED AND REPLACED HSCU IAW EMB MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)