As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE OIL QTY IN RT ENGINE DROPPED FROM 9 QTS TO 5 QTS, OIL PRESSURE REMAINED NORMAL. REDUCED POWER AND MADE UNSKD LANDING. CSD TRA553 WET SPLINE CAVITY O-RING LEAKING DUE TO DETERIORATION. REPLACED CSD AND PACKING PER MM D9-24-03.