As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INITIAL CLIMB AT APPROX 1800 MSL, SMOKE TOILET CAUTION MESSAGE ON EICAS. HAZE IN CABIN CAUSED LAV SMOKE DETECTOR TO GO OFF. MTX INSPECTED ACM'S, NO DEFECTS NOTED. PERFORMED ENG RUNS IAW AMM 71-00-00, AND APU RUN IAW 49-10-00. NO SMOKE NOTED ON ALL BLEED CONFIGURATIONS. LAV SMOKE DET CHECKS GOOD IAW AMM 26-16-01. OK FOR SERVICE.