As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL, THE CREW HEARD A LOUD POP FROM THE NR 4 ENGINE. THE EGT ROSE INTO THE RED AND OIL PRESSURE BEGAN TO DROP. THE ENGINE WAS SHUT DOWN AND TAKEOFF WAS ABORTED AT 20 TO 25 KTS. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE FOUND METAL IN THE TAILPIPE. THE ENGINE WAS REPLACED. EXACT PART CAUSING PROBLEM TO BE DETERMINED.