As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DAY - ON FLIGHT 4198, RETURNED TO GATE, RIGHT ENGINE DEGRADE CAUTION MESSAGE AND RIGHT FADEC NR 2 STATUS. MAINTENANCE PERFORMED FAULT ISOLATION SUBTASK 72-00-00-810-802. NO DEFECTS NOTED. MAINTENANCE PLACED THE RIGHT FADEC ON MEL 73-21-1C. AIRCRAFT RETURNED TO SERVICE.