What was found
TYS, AIRCRAFT DECLARED AN EMERGENCY LANDING FOR ENGINE 1 THRUST REVERSER, DISAGREE IN FLIGHT (MESSAGE WENT AWAY WHEN THE LANDING GEAR WAS LOWERED) AND LANDING GEAR AIR/GRD FAIL ON EICAS IN FLIGHT (MESSAGE WENT AWAY AT TOUCH DOWN). MAINTENANCE REMOVED AND REPLACED RELAYS KO453, KO352 AND KO353 IAW 20-13-03, OPS CHECKED GOOD. AIRCRAFT RELEASED TO SERVICE.