See http://www.factsfacts.com/MyHomeRepair/springs.htm

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"Phil Morgan" wrote in message
...
Noticed one side is broken, but common sense tells me I should have
someone replace both of them. System was installed in '92. Can anyone
give me a ballpark figure for what it will cost to replace the springs
(and probably the tension lines running from the bottom of each door side
to the pulleys at the top of the door frame?

thanks,
Phil