As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GSP - FLT 3758 - DURING MAIN TRIM SWITCH ACTIVATION CREW REPORTED AN EICAS WARNING PITCH TRIM MAIN INOPERATIVE AND PITCH TRIM BACKUP INOPERATIVE. COMPLIED WITH CHECKLIST AND PITCH TRIM C/B RESET PROCEDURE WAS PERFORMED. MAIN AND BACKUP TRIM SYSTEMS BOTH RECOVERED. MAINTENANCE COMPLIED WITH ETN EM 27-028R1 AND REMOVED AND REPLCED THE HSCU IAW EMB MM. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)