As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON POWER UP OF THE ACFT FOR THE DAY, STATIC FREQUENCY CONVERTER NR 2 HAD AN INTERNIAL FAILURE RESULTING IN COMPLETE BOX FAILURE. FREQUENCY CONVERTER WHEN INSTALLED ON ACFT WAS IN NEW CONDITION. SINCE INSTALLATION PART HAS ACCUMULATED APPROXIMATELY 90 HOURS OF OPERATION WITH NO DEFECTS NOTED. INSPECTED AREA SURROUNDING PART INSTALLATION WITH NO DAMAGE OR DEFECTS NOTED. R & R STATIC FREQUENCY CONVERTER WITH NEW. OPS CHECK GOOD.