As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT LEFT SIDE LAVATORY SMOKE DETECTOR ACTIVATED DURING CRUISE. A/C PACKS AT 12 & 1 O'CLOCK IN AUTO MODE. COOLED PACKS AND SMOKE DETECTOR STOPPED. FOUND SMOKE DETECTOR DIRTY AND WET. CLEANED AND DRIED THE AREA. ALL FUNCTIONAL CHECKED GOOD.