As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE TO DTW OVEN 1-27 STARTED TO SPARK AND EMIT SMOKE. THE FLIGHT CONTINUED ON TO DTW AND MADE AN UNEVENTFUL LANDING. MAINTENANCE WOULD DEFER THE OVEN TO MEL AND WOULD LATER REPLACE RELAYS Y7PR003 AND Y7PR004. SYSTEM OPERATION WAS NORMAL AT THE TIME OF RELAY REPLACEMENT.