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The drain pump is likely able to be accessed by removing the lower panel in the front from below the door. The filter will unscrew, allowing access to the pump and lower portion of the drain hose for cleaning. A condenser brush (available at link below) will allow you to "scrub" the inside of the drain hose.
Unfortunately, the odor is an inherent problem with front loading machines, especially if you do not use a cleaner at least monthly. The tabs be, low are industrial strength and will last for 2 years. I would strongly encourage you use them monthly.
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