What was found
PSP - FLIGHT 2975, THE CREW REPORTED A LAV SMOKE WARNING IN CLIMB, THE AIRCRAFT RETURNED TO PSP WHERE IT LANDED WITHOUT INCIDENT AND MAINTENANCE OPERATIONALLY CHECKED THE LAV SMOKE DETECTOR, WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. THE DISCREPANCY REPEATED AND THE AIRCRAFT AGAIN RETURNED TO PSP WITHOUT INCIDENT WHERE MAINTENANCE PLACED THE LAV SMOKE DETECTOR ON MEL 26-14-00 CAT C CONTROL 068098, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. DURING MAINTENANCE INSPECTION IN IAH, THE LAV SMOKE DETECTOR WAS REMOVED AND REPLACED, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE MEL REMOVED, AND THE AIRCRAFT APPROVED FOR RETURN TO SERVICE.