As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, FORWARD LAVATORY SMOKE DETECTOR ACTIVATED. THERE WAS NO SMOKE FIRE OR FUMES. MAINTENANCE FOUND SMOKE DETECTOR PROBE NOT SECURED PROPERLY. SWAPPED SMOKE DETECTOR FROM FWD LAVATORY TO RIGHT AFT IAW AMM 26-14-01. FWD DETECTOR OPS TESTED OK IAW AMM 26-14-01.