As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FINAL APPROACH, M/R RPM DROOPS. PILOT MADE SOFT LANDING ON THE RUNWAY. INSPECTED AND PNEUMATIC LEAK CHECK AND FOUND AIR LEAKS FROM GOVERNOR BELLOWS OF THE FUEL CONTROL UNIT. REMOVED AND REPLACED WITH SERVICEABLE FCU. PERFORMED RUN-UP LEAK CHECK AND NG TOPPING CHECK. ACFT RETURNED TO SERVICE.