As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT 4167 - THE FLIGHT RETURNED TO FIELD WHEN AFTER TAKEOFF, THE CREW RECEIVED A PROX SYSTEM FAULT 1 INCH STATUS MESSAGE ACCOMPANIED BY GEAR AND FLAP INDICATIONS FAILING TO DISAPPEAR AFTER CLEANUP. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE NOSE LANDING GEAR WEIGHT OFF WHEELS NR 2 PROXIMITY SENSOR UNREASONABLY FAR. THE SENSOR WAS ADJUSTED AND THE OPERATONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.