I have a pocket door (no idea what brand) that has fallen off the wheel track at the top. It is sitting in the pocket - I can pull it mostly out, but it is obviously not working. I am able to life the door up and get the righ-most wheel back on the track, but not the rest of the door. So the left side just sags down. I will assume I need to take off the trim and re-hang it that way. Anybody done this repair and can direct me would be great.