What was found
BIL - FLT 2573 - CREW WS ON DOWNWIND LEG WHEN THE HYDRAULIC PRESSURE LIGHTS STARTED COMING ON INTERMITTENTLY. AFTR FLAPS WERE SELECTED TO 1/2 AND WENT TO THAT SETTING, THE GEAR WOULD NOT INDICATE DOWN AND LOCKED WHEN GEAR DOWN WAS SELECTED. CREW FOLLOWED GEAR EMERGENCY EXTENSION PROCEDURES AND GEAR LOCKED DOWN, WITH ''THREE GREEN'' INDICATED. FULL FLAPS DOWN WAS SELECTED ON FINAL AND FLAPS WENT TO FULL POSITION. CREW LANDED WITH NO FURTHER INCIDENT. HYDRAULIC LEAK CAUSED LOSS OF HYDRAULIC FLUID. REMOVED DAMAGED PORTION OF FLAP UPLINE IN LEFT WHEEL WELL AND SPLICED IN NEW LINE. GEAR SWING AND FLAP OPERATION OPS CHECK GOOD. HYD SYSTEM RESERVICED. (M)