What was found
NR 2 ENG INDICATED A RAPID LOSS OF OIL, FOLLOWED BY LOW OIL PRESSURE IND. CREW SHUTDOWN NR 2 ENG & DIVERTED FLT, LANDED WITHOUT INCIDENT. TROUBLESHOOTING FOUND NR 2 ENG C-SUMP LINE CLOGGED WITH COKE AT 9 O'CLOCK STRUT UNDER AFT CENTER BODY. LINE CLEARED. ENGINE SERVICED & RUN AT IDLE & PART POWER FOR 5 MINS. OPS CHKD GOOD WITH NO LEAKS NOTED. NR 2 ENG REMOVED FOR TROUBLESHOOTING & TEARDOWN TO DETERMINE CAUSE OF FAILURE. COKE SHEDDING OCCURRED WHICH LEADS TO COKE BUILD-UP & RESULTED IN CLOGGING OF C-SUMP LINE. SEVERAL CORRECTIVE ACTIONS WERE IMPLEMENTED AS A RESULT OF THIS FAILURE INCLUDING MONITORING LEVELS OF COKE SHEDDING & INCREASED EMPHASIS ON ENG MX REGARDING CLEANING & INSP OF BEARING COMPARTMENTS