As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE OIL PRESSURE DROPPED TO ZERO PSI SHORTLY AFTER TAKEOFF. LOW OIL PRESSURE ANNUNCIATOR REMAINED EXTINGUISHED. AIRCRAFT LANDED AND RETURNED TO GATE. INSPECTION REVEALED A BROKEN WIRE AT THE TRANSMITTER CANNON PLUG. AIRCRAFT WAS FERRIED TO HYANNIS MAINTENANCE BASE AND REPLACEMENT OF CANNON PLUG WAS ACCOMPLISHED.