Karen B Westerville , OH October 09, 2015 Appliance: Whirlpool 1.8 Cu Ft Microwave MH3184XPQ4 Whirlpool Microwave Mh3184xpq4: Broken microwave grill vent. How to replace Microwave Vent Grille. Removed broken one, snapped in new one Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes