As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING ASA T/C 78273000 FOUND ENG #1 SHORT TIME FAULT MSG # 79-11091 "THE ENGINE OIL PRESSURE SIGNAL (PEO) IS OUT OF RANGE" DEFERRAL REQUIRED. GROUNDED - YES. REMOVED AND REPLACED EEC REF B737-900 AMM 73-21-60/401. (REF ASA LOG PAGE #: 60424007, 60424008,60424010,60424012, 60424014 AND 60424016)