A torsion spring under tension can put you in the ER faster than almost anything else in a garage, and a door that's dropped halfway on its track is not something to wrestle with alone. If the opener just won't respond, check that it's plugged in and that nothing's blocking the photo-eye sensors near the floor - that's a real fix, and it's free. Past that, leave the spring, the cables, and the torsion bar alone. If the door is original to a 2006-era build and has never had the spring serviced, that's exactly the kind of job where the stored tension is still at full factory spec and the margin for error is thin. We'd rather you make one honest phone call than one bad guess.