What was found
AIRCRAFT WAS GROUNDED. AFTER TAKEOFF DURING LANDING GEAR RETRACTION 2 ECAMS ILLUMINATED-LANDING GEAR NOTUPLOCKED AND WE THINK LANDING GEAR DISAGREE. GEAR TOOK LONGER TO COMPLETE RETRACTION CYCLE. AIR NOISE SOUNDED LIKE LANDING GEAR DOOR NOISE WHILE ECAMS WERE ON. RETRACTION CYCLE FINISHED AND ECAMS EXTINGUISHED. NOISE & VIBRATION WHILE ECAMS WERE ON SEEMED COMMENSURATE WITH GEAR UP & DOOR LOCKED. REPLACED NOSE LANDING GEAR PROXIMITY SWITCH 25GA AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 32-31-73-04-400-005.