As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4441 - AFTER TAKEOFF OF TRAINING FLIGHT, CREW NOTICED THE MASTER WARNING FLASHING THEN NOTICED THE OIL PRESSURE LOW ANNUNCIATOR ILLUMINATED. THE ENGINE WAS SECURED AND THE CREW DECLARED AN EMERGENCY. AIRCRAFT RETURNED TO THE FIELD WITHOUT INCIDENT. MAINTENANCE REPLACED THE RIGHT ENGINE OIL COOLER RIGHT INLET LINE. AIRCRAFT WAS RETURNED TO SERVICE. (X)