Clint J Kilgore , TX February 28, 2019 Appliance: Whirlpool Microwave Hood Combo MH1140XMB2 Whirlpool Microwave Mh1140xmb2: Cracked plastic cover and needed replacement. How to replace Microwave Vent Grill. Ordered new door and grill replacement. Had to pry the plastic cover off the new door to get access to the metal hinges that I didn't need. Took the new hinges out. Popped the new door onto the old hinges left on the microwave. Then pushed the cover over the door and replaced the 3 screws and looked good as new. Might have taken 15 min maybe. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes