What was found
IAH - FLIGHT 2520, THE CREW REPORTED ELECTRICAL RELAY CONTINUED TO CLICK, AFTER T/O IT SLOWED DOWN CLICKING BUT CONTINUED WHEN THE GEAR WAS LOWERED. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED RELAYS K0023 & K0455, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.