As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GRB - FLT 4240 - JUST BEFORE ENGINE START, FLIGHT ATTENDANT NOTED SMOKE COMING FROM FWD PART OF MAIN CABIN. MAINTENANCE FOUND THAT THE AIR EXTRACTION FAN HAD FAILED. R/I'S AIR EXTRACTION FAN. PERFORMED OPERATIONAL CHECK SATISFACTORILY AND RETURNED A/C TO SERVICE. (M)