As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE, ON CLIMB-OUT FLT CREW NOTICED LEFT ENGINE OIL PRESSURE FLUCTUATIONS, FOLLOWED BY LOW LEFT OIL PRESSURE GAUGE INDICATION. SHORTLY AFTER LEFT OIL PRESSURE LOW ANNUNCIATION. FLT CREW DECLARED EMERGENCY AND RETURNED TO AIRPORT WITHOUT INCIDENT. MAINTENANCE TIGHTENED LOOSE LEAKING B-NUT ON TORQUE TRANSMITTER, OP/C LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.