What was found
DURING ROUTINE SERVICING/LUBE OF NLG DRAG STRUT, NOTICED AFTER LUBE, RAMP ASSY WAS PROTRUDING FROM PIN. DISASSEMBLED UNIVERSAL JOINT OF DRAG STRUT AND FOUND RAMP ASSY CORRODED IN 2 PIECES. IN TURN, ALL PINS, UNIVERSAL JOINT, AND RAMP ASSY'S WERE REPLACED DUE TO CORROSION. SUSPECT WATER INGRESS THROUGH RETAINING BOLT. RECOMMEND SEALING BOLT ENDS AND PERIODIC INSPECTIONS OF PINS AND RAMPS.