What was found
IN CRUISE WHEN THROTTLES WERE RETARDED, NR1 CSD LOW OIL PRESSURE LIGHT CAME ON AND THEN WENT OFF, OCCURRED REPEATEDLY. ALSO, AUTOPILOT DISENGAGED MANY TIMES FOR NO REASON. REPLACED NUMBER ONE ENGINE CONSTANT SPEED DRIVE, OIL COOLER AND OIL FILTER. RAN ENGINE, SYSTEM CHECKS OK. SHOP FINDINGS FOUND CONSTANT SPEED DRIVE HAD INTERNAL FAILURE CAUSING THE LOW PRESSURE.