As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS UPON REACHING CRUISE ALTITUDE FROM DFW, OBSERVED ABNORMAL OIL CONSUMPTION ON LT ENGINE. LANDED IN MCI AS A PRECAUTIONARY MEASURE. MAINTENANCE IN MCI FOUND NR 4 BREATHER LINE O-RING BROKEN. REPLACED O-RING AND LEAK CHECK GOOD. ACFT RETURNED TO SERVICE.