As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE SHOWS EVIDENCE OF EXTERNAL OIL LEAKAGE WITH OIL ON COWLING. GROUNDED - YES. PERFORMED BOTH EXTERNAL SURFACES AND OIL SYSTEM INSPECTION REF B737-9 AMM 79-00-00-210-801-G00 AND 79-00-00-210-802-G00. USING A BLACKLIGHT, FOUND #2 ENGINE OIL TANK SOAKED IN OIL. REPLACED OIL TANK FILLER CAP O-RING REF AMM TASK 79-11-03/401. LEAK CHECK GOOD. ALL COWLING THROROUGHLY CLEANED OF RESIDUAL OIL AS WELL AS SURROUNDING COMPONENTS.