What you are talking about is the actual Quad Mainframe, it's serviced in 2 pieces, an Upper and a Lower. Some call what you're describing a "Motor Boom". Major job to replace. I dont think you can repair it with heat but if it flies well, then dont mess with it. JMO. Good Luck and Welcome to the Forum!i am calling the part that holds the engines a strut. Do not know the proper name it.
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