What was found
PRIOR TO PUSHBACK WITH APU BLEED COOLING THE ACRFT AN ODOR SIMILAR TO A DIRTY GYM SOCK EMANATED MOST NOTABLE BETWEEN ROWS 18 THRU 26. FOUND APU INLET CONTAMINATED WITH OIL FROM APU. REMOVED AND REPLACED APU PER A319 WORK CARD 4900-9002. LEAK AND OPS CHECK NORMAL. REMOVED AND REPLACED RECIRC FILTERS PER A319 AMM 21-21, REMOVED AND REPLACED OZONE FILTERS PER A319 AMM 21-51. COMPLETED ALL NO GO ODI STEPS PER AMDS WORK CARDS 0550-2002, 4900-2001, 4916-2001 AND AMDS WORK CARD 2100-2005 ECS CLEANING DUE TO APU. NO SCENT OF OIL OR CONTAMINATION.