What was found
AFTER T/O PF CALLED FOR GEAR UP. WE RECIEVED A MASTER WARNING, TRIPLE CHIME & GEAR DISAGREE WARNING MESSAGE. FOLLOWED QRH. ALL GEAR INDICATED GREEN AND DOWN. LANDING WAS UNEVENTFUL OTHERWISE. NO FURTHER MESSAGES DISPLAYED. NOSE WHEEL STEERING WORKED NORMALLY. FOUND UPPER UPLOCK BOLT NOT ENGAGED INTO EMERGENCY RELEASE LINK ASSY ON LT MLG UP LOCK ASSY. REMOVED AND INSTALLED BOLT THROUGH LINK ASSY IAW 32-34-20. OPS CHECKS GOOD. NO FURTHER DEFECTS FOUND.