What was found
DURING GEAR EXTENSION, THE NOSE GEAR WAS RED, UNLOCKED ON BOTH NR 1 & 2 SYSTEMS, NO AMBER GEAR DOOR LIGHTS, WITH THE RED NOSE GEAR LIGHT ON. GOOD GREEN HYDRAULICS, CYCLED THE GEAR AND STILL RED UNLOCKED ON NOSE. ABOUT SIX MINUTES AFTER EXTENSION NOSE GEAR INDICATED GREEN AND LOCKED ON BOTH SYSTEMS, DID NOT DO A MANUAL GEAR EXTENSION. BITE CHECKED THE PROXIMITY DETECTOR BOX. CODE 63 AND BOX FAILED, RED LED WAS ILLUMINATED. PROXIMITY DETECTOR BOX 54GB WAS REPLACED IAW AMM 32-31-71-04. LT AND RT NOSE GEAR SEQUENCE VALVE WAS REPLACED IAW AMM 32-31-18-04. OPS TESTED IAW AMM 32-31-00-05, TESTED SERVICEABLE.