What was found
GREEN HYD SYSTEM LOSS. FLUID LOST UPON GEAR EXTENSION. BYPASS VLV HAS BEEN REPLACED. AC IS BEING WASHED DUE TO HYD FLUID SPRAYED OVER AC. SERVICING HYD AND LUBING NOSE GEAR THEN SWING WILL BE DONE AND LEAK CHECKS. OPS CHECKED FOUND NO LEAKS. NEXT FLT EN ROUTE TO BOS RCV'D ANOTHER GREEN HYD SYSTEM LEVEL LOW INDICATION. OPERATED AND CK'D THE FOLLOWING: YAW DAMP, TAIL SECTION BOTH WHEEL WELL AREAS, NR 1 ENG PYLON AND REV, NLG AREA, ALL FLT CNTL SURFACES, MLG AREAS. LEAKED CHECKED NR 1 ENG & WHEEL WELL AREA AGAIN DURING HI PWR RUN. NO LEAKS NOTED. SUSPECT LOW QTY DUE TO NLG BYPASS VLV RPL IN SFO & SYSTEM NOT EXERCISED.