As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER T/O, RECEIVED REPORT OF SMOKE IN THE CABIN FROM F/A CREW. ALSO NOTICED A DISTINCTIVE SMELL LIKE BURNED TOAST IN COCKPIT. RETURNED TO BOS TO LAND. FOUND CEILING LIGHT AT 10 DEF WITH BLOWN FUSE. REPLACED LIGHT ASSY. RAN ENGINES AT IDLE AND POWER PACKS ON, NO SMELL OR SMOKE.