As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4534 - LAV SMOKE WARNING AND SMOKE IN CABIN REPORTED. VISUALLY INSPECTED ALL CEILING/WALL FLOURESCENT BULBS/SOCKETS/RECEPTICLE ASSEMBLIES AND FOUND NO DEFECTS. FOUND LEFT BLEED DUCT FUSELAGE PASS THROUGH ASSEMBLY TO HAVE FOREIGN FLUID BAKING AROUND DUCT AREA, CLEANED AREA AND RAN ACM NR 1 AND NR 2 FOR 5 HOURS AND FOUND NO DEFECTS. AIRCRAFT RETURNED TO SERVICE. (M)