For a broken spring, the job is matching the wire size and wind to your door's weight and width, then setting the new spring to the correct number of turns - get that wrong and the door is either too heavy to lift by hand or slams down on its own. For a shifted track, it's re-squaring the rail to the jamb, re-anchoring the brackets into solid framing, and checking the rollers haven't worn oval from running crooked.
One limitation worth saying up front: if the door itself is original to a 1960s-70s build and the panel has started to delaminate or rust through at the bottom, a spring or track repair won't fix the real problem. At that point we'll tell you replacement is the better money, not patch it and have you calling again next winter. We serve Green Bay and the surrounding area out to about Rockland, Lawrence, and Oneida, with closer calls in Allouez, Bellevue, Howard, Ashwaubenon, and De Pere.