As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANTS REPORTED SMOKE/HAZE WITH ACRID SMELL IN "B" ZONE. BULK CARGO VENT FAN STS MSG AT SAME TIME THEN WENT AWAY ("CARGO VENT FAN BULK"). REMOVED AND REPLACED BULK CARGO FAN, TASK 21-26-06-000-801. PERFORMED MAT TEST ON BULK CARGO FAN PASS. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1387107 S/N OFF 01424 FAN, AIR, CARGO OFF 25-2126-9-9001 1424 ON 25-2126-9-9001 1606.