As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 OIL PSI FLUCTUATES ERRATICALLY FROM GREEN INTO YELLOW AND THEN INTO THE RED ARC AS LOW AS 41 PSI ON FINAL. THE NR 1 AC GEN LIGHT ILLUMINATED ITT ON BOTH ENGINES REMAINED NORMAL. NR 1 ENGINE FEATHERED. LANDING UNEVENTFUL. REPLACED NR 1 ENGINE. RETURNED TO SERVICE.