As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 4 ENGINE SLOW TO SPOOL AT MHLM AND DURING APPROACH ENGINE WOULD NOT ACCELERATE PAST IDLE. REMOVED AND REPLACED NR 4 ENGINE FUEL CONTROL UNIT IN ACCORDANCE WITH MM 73-20-1 AND SYSTEM OPERATIONAL CHECK NORMAL ON ENGINE RUN UP IN ACCORDANCE WITH MM 71-00. NO LEAKS NOTED, ALL PARAMETERS NORMAL.