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I would hire a professional on that one. Those look like the torsion spring type, one on each side. When one side breaks, the other one will follow. Better to replace both. If you DIY, make sure rent a spring tensioning tool. As there is probably no other way to do it without the proper tool safely. Not sure if your local Home Depot has those but probably garage door companies do. Do a search on "how to" over the net. Good luck!
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