Maurice K Travelers Rest , SC December 10, 2014 Appliance: Whirlpool Microwave Hood Combo MH1150XMQ0 Whirlpool Microwave Mh1150xmq0: Rack support. How to replace Rack Support. I just popped the old rack support out with a small flat blade screw driver and push the new rack support in. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes