As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT 10 MINS AFTER T/O, NR1 ENG OIL QTY DECREASED TO 0. PRESS AND TEMP REMAINED NORMAL FOR ABOUT 10 MINS. THEN PRESS DECREASED AND INCREASED OUT OF NORMAL RANGE. SHUT ENG DOWN BEFORE PRESS REACHED RED LINE AND OR TEMP HIT YELLOW LINE. FOUND TGB SCAV IN FILTER SCREEN CLOGGED WITH PHENOLIC MATERIAL. REMOVED AND REPLACED NR 1 ENGINE IAW WORK CARDS 71T0101-1 AND 71T0701-1. LEAK AND OPS CHECK GOOD. OK FOR SERVICE.