As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURN TO GATE, LEFT ENGINE OIL PRESSURE DROPPED TO 60 PSI AND REMAINED AT 60 DURING TAXI OUT. OIL PRESSURE NEEDLE BEGAN BOUNCING BETWEEN 60 PSI AND 110 PSI. REMOVED AND REPLACED OIL PRESSURE TRANSDUCER IAW BMM 1900D 79-50-00-207 RAN LT ENG FOR LEAK AND OPS CHK GOOD, NO LEAKS FOUND PN ON/OFF 101-399073-5, SN OFF 4932-1-145.