As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TURBINE AFT SUMP SUSPECTED OIL LEAK #1 ENG. #1 ENG OIL CONSUMPTION MAY HAVE BEEN EXCEEDED. GROUNDED - YES. ACCOMPLISHED ENG OIL CONSUMPTION SPIKE GVI PER B737-800 AMM 71-71-00-890-801-F00, FOUND BIG PUDDLE CAUSE BY LEAKS FROM TURBINE REAR FRAME AFT SUMP. REQUIRES TURBINE REAR FRAME AFT SUMP INSP PER B737-800 AMM 72-56-00-211-801-F00. REMOVED AND REPLACED #1 ENG LUBE UNIT REF AMM 79-21-01. PERFORMED TEST 3A IDLE LEAK CK. NO LEAKS NOTED.