As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STANDBY INVERTER STATUS MESSAGE. EMERGENCY DECLARED. FLIGHT RETURNED TO DEPARTURE. LANDING UNEVENTFUL. MAINTENANCE COULD NOT DUPLICATE FAULT MESSAGE. REMOVED AND REPLACED STATIC INVERTER AS PRECAUTION IAW AMM 24-33-03. OPERATIONAL CHECKED GOOD. AIRCRAFT WAS GROUNDED.