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It's definitely a diy job, it's just a pain getting the stupid springs tensioned right so that the door doesn't slam shut or fly up.
Do both of the springs if one died. Get them both on the bar, then put the bar back in place. Don't try to do each side entirely in one go, it'll just make life difficult. After the bar is back in place, bolt the spring collars to the center plate and start playing with tension. A 4-6' piece of rebar cut in half is all the special tool you'll need for tensioning.
And for the love of God, make sure you get the springs in the proper side.
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