As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AT CRUISE, FL 400, THE RT WING OVHT LIGHT ILLUMINATED. THE CREW ACCOMPLISHED THE APPROPRIATE CHECKLIST. THE NR 3 AND NR 4 FIRE LOOPS FAILED FIVE MINUTES LATER. DISPATCH AND TECH CENTER NOTIFIED. AN ACRID ODOR WAS DETECTED BY THE CREW, SHORTLY AFTER THIS. SMOKE WAS SEEN COMING FROM BEHIND THE P-6 CIRCUIT BREAKER PANEL, FOLLOWED BY A SMALL FIRE IN THE FIRE DETECTION CARD FILE. THIS SDR TO REMAIN OPEN UNTIL CAUSE IS DETERMINED.