As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LEFT MAIN GEAR DID NOT RETRACT. DURING FLIGHT GEAR CAME UP. NORMAL LANDING AT ORD. *S/D* LEFT MAIN LANDING GEAR WAS FOUND WITH INADEQUATE LUBRICANT. THE GEAR WAS LUBED AND WAS OPERATED SEVERAL TIMES TO CONFIRM A NORMAL OPERATION.