What was found
ODOR OF DIRTY SOCKS IN THE FLIGHT DECK AND CABIN. ALSO, A SMOKEY HAZE IN CABIN. ENGINE NOT RUNNING WHEN ODOR AND HAZE APPEARED. WHEN APU AND PACKS AND BLEED OFF, ODORS AND HAZE DISAPPEARED. REMOVED AND REPLACED THE APU IAW MP49111-01 AND MP49111-02. OPS CHECKED GOOD.