Steven F Paducah , TX May 18, 2015 Appliance: Model 721.62643200 Moved into house microwave was missing grease filter (screens) and charcoal filter needed replaced Grease filters slide right in, no tools required. Charcoal filter required removing 2 screws to remove vent cover, then slid right in. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes