As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, CREW REPORT THE RT OIL PRESSURE WAS FLUCTUATING BETWEEN 70 AND 80 PSI AND OCCASIONALY DROPPING TO 50 TO 60 PSI AND THEY WERE GETTING A RED WARNING LIGHT. THE CREW PERFORMED AN AIR-TURN-BACK. OUTSTATION MECHANIC INSPECTED ENGINE CHEC THE CHIP DETECTOR AND ADDED OIL. AC WAS FERRIED BACK. MECHANIC REPLACED THE ENGINE AND RETURNED THE AC TO SERVICE. (K)