As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LEFT ENGINE N1 SURGE IN BOTH CLIMB AND CRUISE POWER AFTER DEPARTURE FROM CLT. AIRCRAFT RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT THE AIRCRAFT AND REMOVED AND REPLACED THE LT FUEL METERING UNIT (FMU) USING THE AIRCRAFT MAINTENANCE MANUAL. MAINTENANCE PERFORMED CHECKS USING THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.