As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF, GEAR DID NOT RETRACT. RED AND GREEN LIGHTS STAYED ON. RECYCLED GEAR & GEAR CAME UP. FAULT TRACED TO OUT OF ADJUSTMENT NOSE LANDING GEAR PROXIMITY SENSOR. PROXIMITY SENSOR BRACKETS, TARGETS AND SPACERS WERE REMOVED FOR INSPECTION AND THEN REINSTALLED AND ADJUSTED TO PROPER CLEARANCES.