As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE LAVATORY SMOKE OCCURRED AT FL290 JUST PIROR TO THE ETP AT 0248Z TRANSIET ALERT DUE TO PASSENGER VAPING IN THE FORWARD LAV NO SMOKE OR FIRE PRESENT. PERFORMED OPERATIONAL CHECK OF LAV SMOKE DETECTION IN ACCORDANCE WITH AMM 26-17-00-710-001-A OPERATIONAL CHECK GOOD OK TO CONTINUE.