What was found
(LP# 3858576) STRONG ODOR IN COCKPIT. SMELLS LIKE DIRTY SOCKS. EXTERNAL AIR CONNECTED, APU OFF. DISCONNECTED GROUND AIR, STARTED APU AND APPLIED AIR. NO CHANGE IN SMELL. REMOVED AND REPLACED APU OIL PUMP AND COMPLIED WITH TASK CARDS 4916-2001, 2100-2002, 2100-2005. REF LP 3858580.