What was found
ON TAKEOFF, DURING GEAR RETRACTION GEAR HANDLE LIGHT REMAINED FLASHING AND ALL 3 RED DOOR LIGHTS WERE ILLUMINATED. ABNORMAL CHECKLIST WAS FOLLOWED, LANDING GEAR EXTENDED AND 3 GREEN LOCKED LIGHTS ILLUMINATED. LANDING WAS UNEVENTFUL. POSTFLIGHT WAS NORMAL. REMOVED NLG UPLOCK ASSY AND INSTALLED REPAIRED UPLOCK ASSY, PERFORMED BLEEDING, ADJUSTMENT, AND FUNCTIONAL CHECK OF NLG UPLOCK AND SYS. WORK DONE IAW AMM 32-322, 32-309, 29-005. FUNCTIONAL CHECK OF NLG UPLOCK ASSY AND SYS. WORK DONE IAW AMM 32-300.