As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS "GEAR DISAGREE" AFTER TAKEOFF. CREW REPORTED NOSE GEAR WOULD NOT RETRACT AFTER ROTATION. RETURNED TO FIELD. REMOVED AND REPLACED THE NLG STRUT-CENTERED PROXIMITY SENSOR HARNESS ASSY IAW AMM. PERFORMED OPS CHECK OF EXTENSION AND RETRACTION SYSTEM IAW AMM. OPS CHECK GOOD.