As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - ON TAXI FOR FLIGHT 4298, L/R FADEC FAULT STATUS MESSAGE. RETURNED TO THE GATE. LEFT AND RIGHT FADEC FAULT 2 STATUS MSGS CLEARED WHEN ENGINES SHUTDOWN. PERFORMED SELF TESTS OF LEFT AND RIGHT FADEC'S IN MDC, SELF TEST GOOD. HISTORY SHOWS LEFT AND RIGHT AIR START SOV FAIL TO OPEN. CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.