As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT835 - ON CLIMB-OUT FROM CLT, THE NR 1 ENGINE N1 AND ALL ENGINE PARAMETERS BEGAN FLUCTUATING. CREW COULD HEAR THAT THE ENGINE WAS SURGING. FLIGHT RETURNED TO FIELD AT CLT. ON APPROACH, ENGINE STABILIZED. FLIGHT LANDED WITHOUT FURTHER INCIDENT WITH NO EMERGENCY BEING DECLARED. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE POWER MANAGEMENT CONTROL. ADJUSTED AND RAN ENGINE. OPERATIONAL CHECK GOOD. (M)