As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT CRUISE FL390 AIRFLOW SURGED HIGH AND LOW FOLLOWED BY FLICKERING OF ALL PILOT DISPLAYS AND PANEL LIGHTS AND ELEC TRU FAULT MESSAGE. DECESION MADE TO RETURN TO MIA AND AIRCRAFT LANDED OVERWEIGHT AND EMERGENCY WAS DECLARED. AIRCRAFT LANDED WIHTOUT INCIDENT. (OPEN)