What was found
B18752 AFT 2 & 1/2 HRS FLT, NR 4 ENG OIL PRESSURE WARNING LT ILLUMINATED WITH OIL PRESSURE INDICATION AT 30 PSI, OIL QTY INDICATION 1/2. AFTER CHANGING THRUST SETTING, OIL PRESSURE INDICATION CONTINUOUSLY DECREASE TO 20 PSI, OIL QTY GRADUALLY DECREASE TO 1/16, OIL TEMP INCREASE TO 110 DEGREE C. BEFORE DESCENT, RECYCLE OIL QTY & PRESSURE C/BS, OIL PRESSURE DECREASE TO "0" PSI UNTIL LANDING. TOTAL AROUND 30 MINS. C/A:GRD INSP ON NR 4 ENGINE FOUND ONE TUBE OF OIL PRESSURE TRANSMITTER BROKEN, IAW MM 72-00-00 CONFIG 3 P682H(4) IF OIL PRESSURE WAS SHUT OFF OR INTERRUPTED FOR MORE THAN 10 SECONDS AT RPM IN EXCESS OF WINDMILL RPM. ENG MUST BE REMOVED FOR BEARING INSP.