DIAGNOSIS You're looking for a pump filter, but the TR7003WN doesn't have a user-serviceable lint filter or pump clean-out like some front-loaders. The main filtration is the lint trap built into the agitator.
FIX To clean the agitator filter, you need to remove the agitator cap (the plastic piece on top). It either pulls straight up or unscrews counterclockwise. Underneath, you'll find a plastic lint screen. Pull it out, rinse it clean under a faucet, and pop it back in. Also, periodically run a cleaning cycle with a washer cleaner or hot water with vinegar to clear out any gunk in the drain pump and hoses.
IF THAT DIDN'T WORK If you're having drainage issues, the problem is likely the drain pump itself being clogged with a sock, hair, or coins. Accessing that requires removing the front lower panel, which is a bit more involved.
HEADS UP Be gentle when removing the agitator cap. Don't pry it with a screwdriver or you'll crack it. If it's stuck, try gently twisting while pulling upwards. And don't run the washer with the cap or lint screen removed.