As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4489, CREW REPORTED SHORTLY AFTER TAKEOFF ON CLIMB, THEY GOT A PITCH TRIM MAIN INOP. CREW DECLARING AN EMERGENCY AND RETURN TO ORD. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED HSCU AND FO'S YOKE PITCH TRIM SWITCH, OPS CHECKS WERE GOOD AT THIS TIME. WORK PERFORMED IAW AMM 27-40-01 AND 27-40-03. AIRCRAFT RETURNED TO SERVICE.