What was found
PILOT REPORTED LANDING GEAR WOULD NOT RETRACT. TROUBLESHOOTING FOUND LT LANDING GEAR UPPER TORQUE LINK INBOARD LUG CRACKED AND BROKEN CAUSING SAFETY (SQUAT) SWITCH ACTIVATING CLIP NOT TO ACTIVATE SWITCH ARM. REPLACED TORQUE LINK WITH NEW PART. LUG HAD APPARENT CORROSION IN OLD FRACTURE LEADING TO FAILURE. SUSPECT CAUSE, OVERTORQUEING DURING A PREVIOUS ASSEMBLY, SETTING UP A STRESS ON LINK LUG. SUBMITTER RECOMMENDS ADHERING TO MANUFACTURES MAINTENANCE INSTRUCTIONS WHEN INSTALLING.