What was found
IAH - FLIGHT 2980, THE CREW REPORTED A LANDING GEAR AIR/GRND FAIL MESSAGE ON TAKEOFF, THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT AND ON LANDING THE CREW REPORTED NO THRUST REVERSER OR SPOILERS, AND AN IC1-2 WOW INOP DURING TAXI TO THE GATE. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR ELECTRONIC UNIT (LGEU), OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.