What was found
NR 3 ENGINE OIL FILTER BYPASS LIGHT CAME ON IN CLIMB. REDUCED POWER AND LIGHT STAYED ON. OIL PRESSURE AND TEMPERATURE NORMAL. RETURNED TO SFO. *S/D* THE NR 3 BEARING CAGE FAILURE WAS DUE TO A FRACTURE AT THE CAGE RIVET HOLE CAUSED BY EXCESSIVE BALL SOCKET WEAR AND RESULTANT ABNORMAL BALL MOVEMENT. A NEW REQUIREMENT TO ROUTE THE NR 3 BEARING FOR OVERHAUL WHENEVER THE HOT SECTION IS REMOVED HAS SIGNIFICANTLY REDUCED NR 3 BEARING FAILURES.