As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 688 THE NR 3 ENGINE FIRE LOOP GROUND CIRCUIT DETECTOR LOOP FLICKERED ON BUMPS DURING TAXI. REMOVED AND REPLACED NR 3 ENGINE FIRE DETECTOR LOOP M447 IAW 26-11-12. PERFORMED ADJUSTMENT TEST 26-11-01. OPS CHECK GOOD DURING ENGINE RUN AND TAXI TO GATE. (W)