What was found
THE FLIGHT CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE AFTER TAKEOFF ALONG WITH A TAKEOFF CONFIG WARNING. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE DOWNLOADED THE CMC AND FOUND MESSAGES FOR LGEU FAIL 1X, NOSE LG PROX SW FAIL 1X, LT WOW PROX SW FAIL 7X, AND RT WOW PROX SW FAIL 7X. THE W509 HARNESS WAS FOUND DAMAGED AND THREE FAULTY PROXIMITY SENSORS WERE ALSO FOUND. BOTH THE W509 AND W510 HARNESSES WERE REPLACED ALONG WITH THE DOWNLOCK PROXIMITY SWITCHES IN THE RIGHT MAIN LANDING GEAR AND NOSE LANDING GEAR. NO FURTHER DEFECTS WERE NOTED.