What was found
INSPECTION TYPE:N/A EMERGENCY DECLARED - AT TOP OF DESCENT FLUID DROPPED TO AUX POSITION PERFORMED LOSS OF FLUID ON PRESSURE CHECKLIST. AS PER QRH LANDING & TAXI IN NORMAL. FLUID INDICATION NEVER DROPPED BELOW AUX POSITION. FOUND LEFT MLG BOGIE SWIVEL UNLOCK CYLINDER PLUG O-RING LEAKING. INSTALLED NEW O-RING ON PLUG & TORQUED PLUG REF MM 20-60-00-2 USING ENGINE DRIVEN AND AUX HYDRAULIC SYSTEMS. NO LEAKS AT THIS TIME.