What was found
AFTER TAKEOFF FUMES SMELLED IN FLT DECK AND CABIN. LATER IN FLIGHT FUMES DID NOT DIMINISH MUCH AND APPEARED TO BE COMING FROM ATR CONDITIONING SYSTEM, DEFFERED. REMOVED AND REPLACE L AND R PACK COALESCER BAGS. PLACARDED APU INOPERATIVE PER MEL 49-01 C/N 90788. ENGINE OPS AND EXTENDED PACK RUNS ELIMINATED RESIDUAL AROMA FROM ECS. VERIFIED APU BLEED WAS SOURCE AFTER ISOLATION. REMOVED AND REPLACED APU PER R6D49004, OPS GOOD MEL CLEARED.