What was found
RECEIVED A HYD 3 LOW PRESSURE CAUTION MESSAGE DURING LANDING GEAR EXTENTION, HYD SYN PG SHOWED 5 PERCENT QTY ON SYS 3, QRH INSTRUCTED MANUAL GEAR EXTENTION, ALL LANDING GEAR SHOWED GREEN DOWN AND LOCKED, RECEIVED A NOSE GEAR DOOR WARNING MESSAGE AND GEAR DISAGREE WARNING MESSAGE. FOUND HYD SYSTEM NR 3 RESERVOIR LEAKING FLUID, REMOVED AND REPLACED NR 3 HYD SYSTEM RESERVOIR IAW AMM 29-12-30, NO FURTHER LEAKS, OPS CHECKED GOOD.