What was found
AIRCRAFT RETURNED, DUE TO LOW OIL PRESSURE ON LT ENGINE. CAPTAIN REPORTED THAT DURING DESCENT THE TEMPERATURE REACHED 630 DEGREE (C) AND VIBRATION WAS PRESENT, LT ENGINE WAS SHUTDOWN. DURING MAINTENANCE CHECK, METALLIC CHIPS WERE DETECTED ON ENGINE CHIP DETECTOR AND FILTER. LT ENGINE WAS REPLACED AND TESTED IAW MM 71-00-02 AND 72-00-01, ALL CORRECT. FLIGHT RECORDER WAS REMOVED TO READ PARAMETERS AND OVERWEIGHT INSPECTION WAS NOT NECESSARY DUE TO AIRPLANE LANDED WITH 118,720 POUNDS AND MAXIMUM LANDING WEIGHT IS 139,500 POUNDS.