As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, GEAR WAS RETRACTED. WOW INPUT FAIL LIGHT ILLUMINATED AND THE NOSE GEAR FAILED TO RETRACT. (MAINS RETRACTED NORMALLY). EXTENDED LANDING GEAR AND RETURNED. TROUBLESHOT SYSTEM AND FOUND A DEFECTIVE PROX SWITCH IN NOSE GEAR HARNESS. REPLACED SWITCH, OPS CHECK GOOD AND RETURNED AIRCRAFT TO SERVICE. (NE03200405858)