As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF PILOT REPORTED THE HYDRAULIC CENTRAL WARNING PANEL LIGHT CAME ON, LOSS OF HYDRAULIC PRESSURE AND QTY DECREASED INTO THE YELLOW ARC AFTER GEAR CAME UP. A NORMAL EXTENSION OF THE LANDING GEAR WAS PERFORMED. MAIN LANDING GEAR HYDRAULIC SWIVEL LEAKING. REMOVED AND REPLACED HYDRAULIC SWIVEL. PERFORMED OPERATIONAL AND FUNCTIONAL CHECK OF THE LANDING GEAR SYSTEM. AIRCRAFT RETURNED TO SERVICE. (M)