What was found
LANDING GEAR INDICATED UNSAFE (RED LIGHT) DURING RETRACTION. ADDITIONALLY, A LOUD THUMPING NOISE WAS HEARD COMING FROM THE NOSE GEAR AREA. CHECKED NOSE STRUT SERVICING, FOUND WITHIN LIMITS. CHECKED UPLOCK SWITCHES FOR PROPER GROUNDS AT PCB'S, FOUND NORMAL. CHECKED RIGGING OF EMERGENCY GEAR RELEASE, FOUND WITHIN LIMITS, AS WELL AS UPLOCK SWITCH RIGGING, FOUND NORMAL. GEAR DOOR RIGGING NORMAL. FOUND NOSE UPLOCK HOOK NOT FULLY RELAXING DURING RETRACTION. DISASSEMBLED UPLOCK HOOK ASSY, FOUND ALL PARTS SERVICEABLE BUT STICKY WITH OLD LUBE. CLEANED PARTS AND LUBED. REASSEMBLED NOSE UPLOCK HOOK, OPS CHECK NORMAL OF LANDING GEAR. WORK DONE IAW MM 32-00-00, 32-30-50 AND 32-60-00.