What was found
(CAN) THE CREW NOTICED THE NR 2 ENGINE OIL PRESSURE ''LOW'' - (NO SPECIFIC VALVE IS KNOWN OR WHETHER IT WAS FLUCTUATING OR STEADY). THE CREW THEN SHUT DOWN FOR THIS PROBLEM WITHOUT THE PRESENCE OF A WARNING LIGHT. THE DEFECT WAS TRACED TO CHAFED WIRING IN THE LOOM BETWEEN THE ENGINE OIL PRESSURE TRANSMITTER AND THE NR 2 ENGINE DISCONNECT . 4 WIRES WERE REPLACED. THERE WAS NO PROBLEM WITH THE ENGINE OIL PRESSURE SYSTEM. AIRCRAFT RETURNED TO SERVICE.