As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 4508698) VERY MILD "DIRTY SOCK" SMELL OCCURED ON TAXI-OUT DURING START OF THE LEFT ENGINE. SMELL RETURNED MUCH STRONGER AT 100 KNOTS ON THE TAKEOFF ROLL. SMELL WAS GONE BY 1,500 AGL. APU OIL COOLER LINE LEAK. R&R APU OIL COOLER PER B737 AMM 49-91. OPS TEST GOOD. LEAK CHECK GOOD.