As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/RDU - FLT 6435 - DURING CLIMB AT 2130 HOURS ON 4-8-98, MADE AN UNSCHEUDLED LANDING AT IAD DUE TO LEFT MLG WOULD NOT RETRACT. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED UPLOCK HOOK ASSY, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)