As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 4040 - AIRCRAFT RETURNED TO GATE AFTER CREW NOTICED LEFT ENGINE OIL TEMP/PRESSURE FLUCTUATION DURING TAXI. OUT STATION MAINTENANCE REPLACED LEFT ENGINE OIL COOLER VERTATHERM IAW MM 79-20-00. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (M)