What was found
AT FL410, OBSERVED A BUMP & SHUTTER APPEARING TO COME FROM NLG. RED GEAR UNLOCK ILLUM & REMAINED ON UNTIL MLG DOWN. ON POST FLT INSP FOUND RT NLG DOOR SHOWED EVIDENCE OF OVERSTRESS. WHEN MLG SELECTED DOWN SYS OPS NORMAL, 3 GREEN DOWN & LOCKED & NO RED UNLOCKED. INSTALLED NEW NLG DOOR ON RT SIDE IAW MM 52-80-20. OPS CHECK GOOD. REMOVED UPLOCK ROLLER BRACKETS. INSTALLED 2 NEW BRACKETS DUE TO DAMAGE. SUSPECT BRACKETS DAMAGED FROM OTHER THAN THIS DISCREPANCY. INSTALLED NEW UPLOCK ROLLER. COMPLETED SEVERAL CYCLES. OPS GOOD. REMOVED MLG DOOR TORQUE TUBE & PILLOW BLOCKS. INSPECTED CLEANED & RELUBED PILLOW BLOCKS & TORQUED TORQUE TUBE & SAFETIED. TUBE ROTATES FREELY IN BLOCKS.