As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, PILOT REPORTED THAT AFTER TAKEOFF, ENGINE NR 2 OIL PRESSURE GAUGE INDICATED ZERO PRESSURE. INDICATION ALTERNATED BETWEEN RED 0 AND AMBER XX. ALL OTHER INDICATIONS WERE NORMAL, NO ELECTRONIC CENTRALIZED AIRCRAFT MONITORING WARNING. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE OIL PRESSURE TRANSMITTER AND PERFORMED OPERATION AND LEAK CHECK IAW AMM 79-33-15 PB 401.