As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A FLIGHT FROM KBED TO KPHL, THE FLIGHT CREW REPORTED A DU3 FAILURE WITH AN ASSOCIATED STANDBY BUS CAS MESSAGE. THEY DECLARED AN EMERGENCY AND DIVERTED TO KMIV, LANDING UNEVENTFULLY. TECHNICIANS REPLACED THE LEFT POWER JUNCTION BOX AND OPERATIONALLY CHECKED EVERYTHING SATISFACTORY.