Broken garage door opener with shut garage doors, must I break out a window?

Asked by msh (4270) December 6th, 2015 from iPhone

I need some help, please! Two car garage. Both doors are on the same older garage door opener system. Only one remaining remote. Old and tempermental. But I must go on about the garage door opener. When I have replaced the smaller-statured battery, I can see the numbers clicked in for the code of numbers for the garage door mechanism (the one at my own house had a shorter number sequence- but opened up on it’s own. A lot!)
This opener has more numbers, but never is accessed except with the opener.
I replaced the battery. Still a no-go. I haven’t found anyone with openers that will work for this system locally. No, I haven’t hunted online. I don’t want to $buy a replacement opener, only to find that the opener, itself, isn’t the problem.
I really don’t want to- but must I bust out a window as a last resort?
I am at a point of being frozen about how to take care of this situation. Any ideas? I would so appreciate the help. Thank you!