What was found
AFTER TAKEOFF, NOSE GEAR AMBER "DOOR" WARNING LIGHTS (FWD AND OVERHEAD) REMAINED ON FOLLOWING GEAR RETRACTION. NO EXCESSIVE NOISE OR VIBRATION OBSERVED. WHEN GEAR WAS EXTENDED AGAIN, "DOOR" LIGHT REMAINED ON (BOTH FORWARD AND OVERHEAD INDICATIONS) RETURNED TO IND. REMOVED AND REPLACED RT NLG DOOR UPLOCK ASSY IAW A310-200 MM 32-31-14, SYS OPS OK, A/C OK 4 FLT RII:377762. PREMATURE REMOVAL/INSTALLATION OFF MFG A25431001POS RT SRL M579, ON MFG A25431001-2, SRL U1606 TAG 609521.