What was found
DIRTY SOCK ODOR BEGAN DURING OR JUST AFTER NR 1 ENG START, NR 2 ENG NOT RUNNING. USING APU BLEED & CONTINUED THROUGH TAXI, TAKE OFF & CLIMB. ODOR DISSIPATED AFTER LEVEL OFF AT CRUISE, FL300, APPROXIMATELY 20 MIN AFTER TAKEOFF. APU WAS SHUT DOWN AFTER ENG 2 START. ODOR RETURNED ON DESCENT, FOUND APU OIL OVER SERVICED IAW NON-ROUTINE 4946345.