As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE MESSAGE ON EICAS AT 400 FT. SMELLED SMOKE IN CABIN AND LAVATORYSHE ALARM WENT OFF. R & R THE LAVATORY SMOKE DETECTOR AND TESTED PER AMM 16-14-02. OPS CHECK GOOD. OK FOR RETURN TO SERVICE IAW FIM 26-14-00-810-802-A. TROUBLESHOOTING SMELLED SURFACE IN CABIN, RAN BOTH ENGINE AND APU IN MANY PACK / BLEED CONFIGURATION EVALUATION FLIGHT SATISFACTORY