As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MLG LANDING GEAR RETRACTION DID NOT RETRACT. AT GEAR RETRACTION ON TAKEOFF MAIN LANDING GEAR LIGHTS REMAINED GREEN AND MAIN LANDING GEAR REMAINED DOWN. NOSE GEAR RETRACTED NORMALLY. RAN ABNORMAL CHECKLIST H2 "UNLOCK", "IF LANDING GEAR WILL NOT RETRACT". PUT GEAR HANDLE DOWN PER PROCEDURE AND RECEIVED "3 GREEN". RETURNED FOR NORMAL LANDING. SERVICED ALL STRUTS PER MM.