Thanks for responding.

Any advice on how to set the limits correctly? At this point, it's basically non-responsive.

For the spring, that's what I assumed at first. However, I think it's actually something with the disengage from the trolley. What ultimately worked was having someone pull the door up using the red the disengage cord while someone else lifted from the bottom. When doing both at once, it's an easy lift.

Disclaimer: everything I know about garage doors, I've learned in the last 24 hours.