What was found
SJU - FLT 760 - IN CRUISE QTY DROPPED TO HALFWAY ON QTY GAUGE, FOLLOWED BY AN ODOR OF HYDRAULIC FLUID (NOXIOUS). INVESTIGATION REVEALED FLUID ESCAPING FROM CARGO DOOR SWIVEL JOINT. REMOVED AND REPLACED SWIVEL AND AUX PUMP PRESSURE LINE. OPS CHECK OK IAW MM 29-20-2, 52-36-1 AND 20-60-0. (M)