What was found
DEN - FLIGHT 5897, THE CREW REPORTED A LANDING GEAR AIR / GRND FAIL MESSAGE ON CLIMB. THE AIRCRAFT RETURNED TO DEN WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT, OPERATIONALLY TESTED THE LANDING GEAR EXTENSION / RETRACTION SYSTEM MULTIPLE TIMES ALL WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.