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Good afternoon, I can tell you with certainty and confidence that you need to replace your oven igniter , this is a very common issue on these, the igniter gets weak and does not draw enough amps to open the safety valve, these need to be replaced on average every 3 to 4 years sometime sooner depending on how much you use the oven. I am including a link where you can order the part . http://www.repairclinic.com/PartDetail/Oven-Igniter/12400035/3377?modelNumber=MGR5770BDW?RCAID=1000065 this is located under the bottom panel inside the oven . Hope this helps, the only thing I ask of you is to please rate me with one of the top 3 ratings. If there is anything else I can help you with today just let me know. You can continue asking questions for as long as you like even after you rate me. Click the continue conversation link if you would like to continue this conversation. If you are done rather than rating me with a 1 or 2 smiley faces please use the (continue conversation) link and tell me what else I can do or what else you would like to know so that I can get you that information so I can improve my customer satisfaction rating. You may receive an email with my answer if so please sign back in and accept on the site itself. Its the only way I get paid for helping you. thank you and best wishes , Bryan
Is this part easy to replace. how do i get to it.