As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GYRO AND COMPUTER ON ADI (BOTH), HEADING ON BOTH HSI. RETURNED TO FAT. FOUND DISCREPANCY TO CLEAR WITH NUMBER ONE INVERTER TURNED OFF. REPLACED NUMBER ONE INVERTER. OPS CHECKS GOOD AT THIS TIME. P/N ON: PC251-1C, S/N: 6074, S/N OFF: 8356.