As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 494 - EN ROUTE ORD-DTW, DETECTED SMOKE BEHIND CAPTAINS ATTITUDE INDICATOR. LANDED DTW WITHOUT FURTHER INCIDENT. REPLACED CAPTAINS SYMBOL GENERATOR AND CAPTAINS PRIMARY FLIGHT DISPLAY. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)