As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 1 ENGINE BEGAN TO VIBRATE AND THE EGT ROSE TO GREATER THAN 710 DEGREES WHILE ON FINAL APPROACH. HE VIBRATION AND EGT RISE WERE ACCOMPANIED BY ENGINE POWER LOSS. THE ENGINE WAS NOT SHUTDOWN, AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. THE NR 1 ENGINE WAS REMOVED AND REPLACED. ENGINEERING CONCLUDED THAT THE PRIMARY CAUSE OF ENGINE VIBRATION AND EGT RISE WAS DUE TO FAILURE OF THE NR 4 BEARING.