at a guess i would say one of the suspension wires have broken
so the door will be down on one side,if thats the case i would suggest you call a guy out,you can do it yourself,but unless you have the right tool it sa hell of a job
gts
May 2015
Fix as in Install?
Or fix as in repair?
You need to say more to get a sensible answer - a trouble statement - what is wrong with what?