What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
During flight left engine shut down due low oil quantity
In vicinity of ord, declared pan pan and requested diversion to ord. Firetrucks followed aircraft down runway, nothing to note from emergency crews, taxied to gate and deplaned normal
Maintenance evaluation, LH engine ifsd due to low oil quantity and low oil pressure warning. During leak isolation maintenance found oil leak from union on fuel oil cooler. After closer inspection the o-ring is protruding, and union doesn't appear to be flush to foc. Defect L625930 was created. Aircraft remains on the ground in ord and it’s expected that an engine is required
As the FAA filed it
DURING FLIGHT LEFT ENGINE SHUT DOWN DUE LOW OIL QUANTITY
IN VICINITY OF ORD, DECLARED PAN PAN AND REQUESTED DIVERSION TO ORD. FIRETRUCKS FOLLOWED AIRCRAFT DOWN RUNWAY, NOTHING TO NOTE FROM EMERGENCY CREWS, TAXIED TO GATE AND DEPLANED NORMAL
MAINTENANCE EVALUATION, LH ENGINE IFSD DUE TO LOW OIL QUANTITY AND LOW OIL PRESSURE WARNING. DURING LEAK ISOLATION MAINTENANCE FOUND OIL LEAK FROM UNION ON FUEL OIL COOLER. AFTER CLOSER INSPECTION THE O-RING IS PROTRUDING, AND UNION DOESN'T APPEAR TO BE FLUSH TO FOC. DEFECT L625930 WAS CREATED. AIRCRAFT REMAINS ON THE GROUND IN ORD AND IT’S EXPECTED THAT AN ENGINE IS REQUIRED