As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF NOSE GEAR WOULDNT RETRACT RAN GEAR DIAGREE CHECKLI ST RTRN TO AIRPORT INTIAL EVALUTION FOUND A "DOWNLOCK PIN " INSTALLED IN THE NLG . THE MLG WERE NOT PINNED. REMOVED THE NLG DOWNLOCK PIN AS PER FIM 32-30 TASK 810 . NO FURTHER ACTION REQUIRED .