My garage door spring broke last year. Called Romac and they said they would only fix it if I had both strings replaced. I believe the cost was going to be around $300 for parts and labor.
I looked on the Internet and found numerous DIY videos on how to replace and preload the torsion springs. If I recall, my total cost cost was around $35-$50 to do one spring. Caution: It's not a job for a non-handy guy.
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