a wrote:

I can't see it being a torsion spring issue as the spring is what helps the
door go up (by taking up most of the weight) & you report the door goes up
fine.

But many openers have enough pull to open the door w/ only one of the
two springs but that wouldn't be enough to balance it w/o the
opener....I'm just suggesting OP make sure before just yankin' on the
release cord...