No clue what it will cost, but when I was little while living in Kentucky, our garage door did something similar. So instead of fixing it, we would manually open and close it. So one day I went out to open the garage door, and as I start raising it, I noticed something long laying on the strut which I would use to grab and lift. Upon quick inspection I noticed it was a copperhead snake looking right at me about eye level. Holy crap talk about an adrenaline rush!