As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2072 RIC-IAH - THE CREW REPORTED A MOMENTARY LAVATORY SMOKE WARNING DURING CRUISE. NO SMOKE CONDITIONS WERE NOTED AT THAT POINT AND THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE PERFORMED FUNCTIONAL TESTS OF THE LAVATORY SMOKE WARNING SYSTEM AND COULD NOT FIND AND COULD NOT DUPLICATE THE WARNING.