What was found
ON FINAL FOR 10L INTO KORD, GEAR DISAGREE AND TAILSKID EICAS RAN CHECKLIST AFTER GO AROUND. ABORTED APPROACH. (AAP) CAME BACK AFTER CALLING MX CONTROL AND RUNNING QRH. IN ORD, CONFIRMED TAIL SKID DID NOT DEPLOY. ABOUT 10 MINUTES AFTER BLOCK IN THE TAIL SKID DROPPED ON ITS OWN. LANDING GEAR LEVER CONTROL MODULE WAS CLEANED AND LUBED PER B767 AMM 32-31-01, OPS CHECK GOOD. FIM TASK 32-71 F/T 803 C/O. SYSTEM FUNCTION WAS NORMAL. NO FAULTS FOUND. AIRCRAFT RETURNED TO SERVICE.