As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN OPENING FAN COWLS ON #1 ENGINE INBOARD SIDE, NOTICED A LARGE SPRAY PATTERN ON THE INBOARD SIDE OF FAN COWL FOUND EEC CABLES WET WITH OIL AS WELL FOUND OIL TANK VENT LINE CROOKED AND NOT SEALING 2 INSERTS WERE BROKEN ANS 2 INSERTS WERE ALMOST BROKE. GROUNDED - YES. REMOVED AND REPLACED OIL TANK REF B737-800 AMM 79-11-01.