As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE OIL PRESSURE DROPPED TO 28 PSI ACCOMPANIED BY OIL PRESSURE LIGHT WHEN ENGINE WAS RETARDED TO IDLE. OIL QUANTITY BEGAN TO FLUCTUATE FROM 4.0 TO 2.5 GALLONS. SECURED ENGINE AT 0935Z, ZERO OIL PRESSURE. REPLACED NR 1 ENGINE IAW J-CARD 7002, OPS AND LEAK CHECKED GOOD.