As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE, ENGINE 1 EPR MODE FAULTED DURING CLIMB. CREW REVEALED THAT AT THROTTLE BACK AT TOP OF CLIMB NR 1 ENGINE THRUST LOCKED AND EPR MODE FAULT APPEARED. R & R FMU IAW AMM 73-22-52-400-010-B IAW AMM ACCOMPLISHED FMU/STARTER VALVE TEST IAW 80-13-51 AND FADEC SELF TEST IAW AMM 73-22-00. OPS CHECK GOOD.