The filter is actually the trap on the drain pump. If the model number you have listed is correct, the drain pump on this washer can be accessed by removing the toe panel directly below the door. Locate and remove the screws that hold the panel in place along the bottom front edge and the panel comes free. The drain pump is located in the front below the wash tub.
In order to clean out the trap area of this pump, you need to remove the large rubber inlet hose from the pump. Using a pair of pliers, you can squeeze to release the hose clamp off the inlet side of the pump and pull it free from the pump. It is common for this area to collect debris and begin to smell. Clean as necessary.
NOTE: Prior to removing the drain hose, its a good idea to remove any residual water from the drain lines and wash tub to avoid a messy clean up. A smart tip is to use a wet/dry shop vac and pull a vacuum on the drain line at the wall. This will pull everything out of the internal drain lines, pump and lower wash tub and minimize any mess.
The following link can give you some excellent tips on how to prevent mold and mildew inside a front loader:
http://www.fixya.com/support/r3608512-getting_rid_front_loader_mildew_odor
Another item to note, if you are using the wrong detergent, or using the improper amount of detergent, this will also contribute to odors in the washer. The improper concentration of detergent will cause soap scum build up in which dirt and debris will collect. It will also contribute to premature wear and tear on the pump motor and seals. Use HE detergent only.
If you have any questions, or if your model number is different than the one you have this question listed under, please let me know. I hope this has been helpful to you.