As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AFT LAV WARNING MESSAGE AT V2, FLIGHT 3269. COMPLIED WITH SERVICE BULLETIN, REMOVED AND REPLACED THE LEFT ENGINE SEAL VALVE IAW AMM. PERFMOED ENGINE RUNS USING APU AIR AND ENGINE BLEED AIR. COULD NOT REPRODUCE, NO LAVATORY SMOKE WARNING MESSAGES DISPLAYED AT ANYTIME. NO ODOR OF SMOKE IN THE CABIN OR LAVATORY. CHECKED GOOD.