As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OF 7790 CREW REPORTED A TOILET SMOKE MESSAGE. FLIGHT RETURNED TO FIELD AND LANDED UNEVENTFULLY. THE COALESCER BAG WAS FOUND DIRTY AND REPLACED. A SATISFACTORY OPERATIONAL CHECK WAS PERFORMED AND AIRCRAFT RETURNED TO SERVICE.