What was found
AFTER TAKEOFF & GEAR RETRACTION, DEVELOPED LOUD AIR NOISE & MINOR AIR FRAME VIBRATION BELOW & FWD OF COCKPIT. BELOW 25000 FT 280 KTS AMBER XXXX ON NOSE GEAR DOOR ECAM WHEEL PAGE, GEAR EXT ALL NORMAL. FOUND AFT RT NLG DOOR FWD HINGE ASSEMBLY WORN & REPLACED IT IAW CMM 52-82-32 & 32-22-13-400-001A. PERFORMED SATISFACTORY FUNCTIONAL TEST OF NORMAL EXTENSION & RETRACTION OF NLG SEVERAL TIMES, NO FAULTS NOTED.