As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE INDICATION ON THE EICAS SHORTLY AFTER TAKEOFF. FOGGY CABIN/POSSIBLY DE-ICING FLUID IN AIR CONDITIONING SYSTEM. PERFORMED ENGINE RUNS IAW RR MM71-00-80 AND COULD NOT DUPLICATE AND LEAK CHECK WAS GOOD. AIRCRAFT RELEASED AND RETURNED TO SERVICE