As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 4 ENGINE FAILED INFLIGHT DURING FLIGHT 3426, SHOWED OVERSPEED-LOW PRESSURE. NR 4 ENGINE SHUTDOWN INFLIGHT, A/C RETURNED TO MSP. MAINTENANCE PERFORMED RESISTANCE AND MEGGER CHECK OF ENGINE INSULATION. CHECK AND MEGGER CHECK OF PRIMARY OVERSPEED PICK-UP LEAD NR 4 ENGINE. INSTALLED SERVICEABLE CONTROLLER P/N 2-313-007-01 S/ N ON 1270, S/N OFF 1408 IAW HONEYWELL MM, CHECK CHIP COLLECTORS FOR METAL NR 4 ENGINE. ALL CHIP DETECTORS CHECK GOOD, NO FOREIGN MATERIAL FOUND.