What was found
DURING TAKEOFF RUN, CREW RECEIVED A LOW OIL PRESSURE LIGHT ON THE LT ENGINE AND ABORTED TAKEOFF. AFTER CLEARING THE RUNWAY, INDICATION WAS NORMAL. SHORTLY AFTER DEPARTING WITH INDICATIONS NORMAL, THE LOW OIL PRESSURE LIGHT AGAIN ILLUMINATED. THE CREW RETURNED TO DEPARTURE AIRPORT FOR MAINTENANCE. MAINTENANCE TIGHTENED B-NUT ON THE HIGH PRESSURE LINE AT THE OIL PRESSURE TRANSMITTER, SERVICED AND RAN ENGINE FOR LEAKS, OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.