As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - INFLIGHT SJD-ORD. CAPTAIN REPORTED HIS NAVIGATION DISPLAY WAS NOT WORKING. EMERGENCY DECLARED FLIGHT DIVERTED DFW LANDED WITHOUT INCIDENT. FOUND NUMBER 1 HEADING HAD NUMBER 2 ATTITUDE FAILURES. REPLACED NUMBER 1 ATTITUDE HEADING REFERENCE SYSTEM UNIT. SYSTEM GROUND CHECK NORMAL OPERATION.