What was found
BTR - FLT 3865 - PILOT REPORTED AFTER DEPARTURE, THE NR 2 OIL PRESSURE WARNING LIGHT ILLUMINATED, FOLLOWED BY A FLUCTUATING OIL PRESSURE GAUGE WHICH THEN DROPPED TO 0 PSI. THE CREW SHUT DOWN THE NR 2 ENGINE AND LANDED AT BTR WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 2 OIL COOLER TO BE CRACKED. MAINTENANCE REMOVED AND REPLACED THE NR 2 OIL COOLER AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)