As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NR 1 FIRE WARNING GROUND FAULT DETECTOR LIGHT ILLUMINATED IN FLIGHT ,PERFORMED ENGINE FIRE WARNING TEST PROCEEDURE COM 2,26.31 TESTED NORMAL. LIGHT REMAINED ON UNTIL DECENT INTO MSP. REPOSITIONED FIRE LOOP IN MULTIPLE AREAS OF POSSIBLE FAULT AREAS NR 1 ENGINE GROUND FAULT DETECTOR LIGHT REMAINS OUT OK FOR SERVICE