As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL LEAKING FROM BOTH ENGINES. GROUNDED - YES. VERIFIED OIL CAPS SECURED. PERFORMED ENGINE VENTS AND DRAIN INSPECTION PER B737-9 AMM 71-71-00-200-801-G00. FOUND OIL WAS COMING FROM C-SUMP TUBE IN CORE DRAIN MAST BOTH ENGINES. NO LEAK AT THIS TIME. PERFORMED ENGINE RUN OF BOTH ENGINE IAW AMM 71-71-00-200-801-GOOD. NO LEAKS NOTED. A/C OK FOR SERVICE.