As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT/APPROACH, LOSS OF (A) SYSTEM HYDRAULIC FLUID. LANDING WAS MADE WITHOUT INCIDENT. REMOVED AND REPLACED NR 4 KRUEGER FLAP ACTUATING CYLINDER IAW MM. RESERVICED HYDRAULIC SYSTEM TO FULL, RESAFETIED GUARDED HYDRAULICC SWITCHES, CHECKED CASE DRAIN FILTERS FOR CONTAMINATION-NONE NOTED. OPERATIONAL CHECK IS GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (K)