As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INCREASING POWER ON APPROACH, LT ENGINE REMAINED AROUND 500 LBS TORQUE, DID NOT RESPOND TO POWER LEVER INPUT WHILE RT ENGINE SPOOLED TO APPROX 1200 TORQUE. LT ENGINE AUTOFX TRIGGERED AND TOOK APPROX 2-3 INCHES OF POWER LEVER MOVEMENT TO GET LT ENGINE TO RESPOND TO INPUT. MAINTENANCE OBSERVED CREW PERFORMING RUN UP PER MM 61-21-00, SYSTEM OPERATIONAL CHECKS GOOD.