As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED VISABLE WHITE SMOKE IN CABIN AND LT PACK FAIL MESSAGE. MAINTENANCE PERSONNEL DETERMINED SMOKE TO BE RESULT OF MAIN ELECTRICAL BUS BEING UNTIED WHICH RESULS IN FANS BEING INOPERATIVE. MAINTENANCE PERSONNEL RETIED MAIN BUS AND PERFORMED SATISFACTORY OPERATIONAL CHECK AND AIRCRAFT WAS RELEASED FOR CONTINUED SERVICE