What was found
ECAM CAUTION MESSAGE - Y RSVR LO LVL MESSAGE INOP - HYD FOUND YELLOW HYDRAULIC SYSTEM VERY LOW, SERVICED WITH 3 GALLONS RAN YELLOW HYDRAULICS FOR 2+ HOURS WHILE CYCLING FLIGHT MAIN WING FUEL TANKS AND INSPECTED FOR POSSIBLE HYDRAULIC HYDRAULIC FLUID. T/S PER TSM 29-13-00-810-805-A AND CONTROLS, INSPECTED WHEEL WELLS, APU COMPARTMENT, TAIL CONTAMINATION, NONE DETECTED. ENCLOSED PHOTO OF HYDRAULIC LEVELS 29-13-00-810-801-A. NO LEAKS FOUND. PERFORMED LEAK CHECK IN REF COMPARTMENT HOLE(COMPARTMENT 321AR) WITH NO VISIBLE LEAKS OR AT RELEASE. A/C OK FOR SERVICE. TO AMM 29-00-99-200-001-C1. RAN #2 ENG AND DEPLOYED REVERSER, HYDRAULIC QUANTITY REDUCTION. SUMPED FUEL FROM LEFT AND RIGHT