As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2050, ON TAXI RECEIVED A SECONDARY INVENTER CAUTION MESSAGE. RETURNED TO THE GATE. MAINTENANCE PLACED THE SYSTEM ON MEL 24-8. AIRCRAFT RETURNED TO SERVICE. REPLACED THE SECONDARY INVERTER. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.