As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 398A - FLL-MIA - SMOKE COMING OUT OF CAPTAIN AND FIRST OFFICERS ACM VENTS IN FLIGHT. LASTED ABOUT 10 SECONDS. PERFORMED GROUND RUN UP NO SMOKE NOTED. OPERATED ALL SYSTEMS NO DEFECTS NOTED. POSSIBLE CONDENSATION FROM THE AIR CYCLE MACHINE AIR CONDITIONING SYSTEM VENTS.