As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WARNING DISAGREE MESSAGE DURING RETRACTION ON TAKEOFF. RAN EMER CHECK LIST, UNABLE TO CORRECT, INDICATIONS NORMAL FOR GEAR DOWN. RETURNED TO DEPARTURE FOR LANDING ISSUE WAS WITH NOSE GEAR, NOT MAINS. ADJUSTED NLG PROXIMITY SWITCH SENSOR PX22 IAW AMM 32-61-05. OPS CHECKED GOOD.