As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 5719 - BEFORE TAKEOFF, LEFT ENGINE OIL PRESSURE CWP ILLUMINATED FOLLOWED BY OIL PRESSURE DROPPING TO ZERO PSI. ENGINE SHUT DOWN. MAINTENANCE FOUND NR 1 ENGINE OIL FILLER CAP O-RING CUT. REMOVED AND REPLACED O-RING ON OIL FILLER CAP. SYSTEM LEAK AND OPS CHECKED GOOD. (X)