What was found
AIRCRAFT WAS GROUNDED: ON TAKE-OFF, SMELL OF FUMES IN COCKPIT AND CABIN APU WAS OFF. SMELLED LIKE DEICE/BURNT OIL. RETURNED TO PHL. PERFORMED J/C'S 26L00021001, 26L00021003, 26L00021004. SUCCESSFUL DECONTAMINATION ACCOMPLISHED, LEFT PACK. REPLACED CONDENSER (AALA202103099006), REHEATER (AALA202103099013), OZONE FILTER (AALA202103099014) AND FLOW CONTROL VALVE (AALA202103099015).