Sagging on one side?

Worst case is the torsion bar cross member has rusted away.

Best case is the adjuster is not as tight on one side as the other.

Get the car up and supported on jack stands in the front.

Then with a good light start looking at the cross member.

Raise one wheel up and watch for the socket that the bar is in to twist. ( it should not twist)

With the suspension hanging you MIGHT be able to feel movement of the warm out parts.

If you count the adjuster turns you could unload the torsion bars and the suspension would be hanging free. You could then move every part looking for the loose warm out parts.

If you have a sway bar disconnect one side of that too.