As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: THERE WAS A DIRTY SOCK SMELL {MILD} IN CABIN DURING PRE-FLIGHT AND THEN IN CABIN AND FLIGHT DECK AFTER ENGINE START . SMELL DISSIPATED SLOWLY DURING THE FLIGHT . BUT NEVER WENT AWAY COMPLETELY . ON DECENT WITH POWER PULLED BACK THE SMELL CAME BACK QUITE STRONG AND THEN DISSIPATED AGAIN AFTER LANDING /SHUTDOWN. FOUND OIL LEAKING FROM OIL COOLER TRANSFER TUBES AND REMOVED ANDREPLACED PACKINGS PER AMM 49-91-44.