As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: IN CRUISE FLIGHT AT 310 SMOKE LAVATORY SMOKE ECAM, CREW THEY CHECKED FORWARD LAVATORY WITH PASSENGER INSIDE NO SMOKE /FUMES OR ODORS. REPEATED 2 MINS LATER. CLEANED SMOKE DETECTOR FILTER AS A PRECAUTIONARY MEASURE.