garage door won't close properly
When closing garage door it stops after the first panel gets clear and reverses itself. After disconnecting the opener, and manually closing the door there a tension occurs after the first panel is clear. Nothing obvious is present, but it takes a strong pull to clear the tension and it closes fine from there. Bearings are greased with white lithium and seem ok, both tension coils and wires are ok, can't see any misalignment, and bolts are all tight. Door did have problems up and down in cold (35 degrees, sorry Wisconsin), had to give it help up and down. Any ideas?