As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED-RCVD CAS MESSAGE “LG AIR/GND FAIL.” GEAR WOULD NOT RETRACT WHEN GO-AROUND WAS INITIATED. MESSAGE CLEARED UPON TOUCHDOWN. CORR ACTION- REMOVED AND REPLACED NLG PROXIMITY SWITCH PERFORMED TWO GEAR SWINGS ALL OPS TESTS GOOD.