As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4393, CREW REPORTED AFTER TAKEOFF THAT MAIN PITCH TRIM INOP EICAS MESSAGE APPEARED ON EICAS. EMERGENCY WAS DECLARED AIRCRAFT RETURNED TO FIELD WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED HSCU PER EMB AMM 27-40-01 AND NR 8194; AIRCRAFT RETURNED TO SERVICE AND NR 8194; AND NR 8194; AND NR 8194; AND 8194.