As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LT ENGINE POWER LOSS UP TO 10-15 PERCENT. FUEL FLOW INDICATION LOW, ALL ENGINE INDICATIONS FLUCTUATED, AND ENGINE VIBRATION OCCURED. AFTER A FEW MINUTES PROBLEM DISAPPEARED AND ALL INDICATIONS NORMAL. AIRCRAFT RETURNED TO BHM WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE FUEL CONTROL. CHECKS WERE ACCOMPLISHED AND AIRCRAFT WAS RELEASED FOR SERVICE.