What was found
SUP: FLIGHT DIVERTED. OIL QUANTITY WAS NORMAL AT TAKEOFF, ABOUT 2 HRS PLUS INTO FLIGHT, OIL QUANTITY BEGAN TO STEADILY DECREASE AND CONTINUED UNTIL IT READ ZERO, NO OTHER INDICATIONS, PRESSURE AND TEMPERATURE WERE NORMAL. R & R NR 1 ENGINE IAW AMM 71-00-20. RUN AND LEAK CHECK OK.