Thomas H Durham , NC January 24, 2016 Appliance: Whirlpool Microwave MH7140XFB0 Whirlpool Microwave Mh7140xfb0: Broken vent on microwave. How to replace Microwave Vent Grille. Ordered part on on Tuesday and completed repair Friday morning after part came in Thursday evening. Repair was a snap! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes