As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LAVATORY SMOKE INDICATION ON EICAS AND SMOKE IN THE CABIN. CONTRACT MX TROUBLESHOT IAW FIM 21-20-00-801A AND FOUND NO VISUAL INDICATIONS OR ODORS THROUGHOUT THE ENTIRE PROCESS. RAN ENGINES AT HIGH POWER WITH INFLIGHT ENGINE BLEED/APU CONFIGURATIONS, NO FAULTS PRESENT. ACFT WAS APPROVED FOR RETURN TO SERVICE.