What was found
STL - FLT 315 - INVESTIGATION OF NR 2 ENGINE, S/N 1213, SHUT DOWN DUE TO VIBRATION REVEALED THE NR 3 BEARING, MFG P/N 804061, RIVETS FRACTURED LIBERATING METAL PARTICLES INTO OIL SYSTEM. THE NR 3 BEARING WAS REPLACED AND ENGINE REPAIRED AND RETURNED TO SERVICE.