Thomas J Lithonia , GA December 08, 2015 Appliance: Whirlpool Microwave Hood Combo MH1140XMB1 Whirlpool Microwave Mh1140xmb1: Replaced broken microwave door. How to replace Door Assembly (Black). Removed the 4 screws above the trim / vent. Removed the front and side screws from the underside of the oven hood and lowered on the rear hinge. There are three bolts on the upper and lower hinges of the microwave door that remove easily. Caution there are washers on each of the hinges... Do not lose these. Installation is the reverse. Did the replacement without any additional help. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes