As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMBINATION VOLTAGE AND OVERVOLTAGE REGULATOR FAILED. THIS FAILURE CAUSED A VOLTAGE SPIKE IN THE ELECTRICAL SYSTEM WHICH IN TURN DAMAGED ALL OF THE COM AND NAV RADIOS, THE ANNUNCIATOR PANEL, AND NUMEROUS COMPUTER RELATED AVIONICS ITEMS. MULTIPLE LIGHT BULBS IN THE AIRCRAFT WERE ALSO REPLACED. THE REASON FOR THE REGULATOR FAILURE IS STILL UNCLEAR AT THIS TIME.