I've got a Genie 98 screw drive opener on my garage door. Came with the house, no idea how old it is. There's no safety beam at the bottom, which may give some indication of age. Springs were professionally replaced a year ago, two bad rollers replaced, and I cleaned & lubed the tracks.
When I try to close it, it travels maybe two inches and stops. Various web sites say to check/adjust the limit switches. Does this refer to spring-loaded lever switches mounted on the track? If so, where is the trip thing (on the door) supposed to land, relative to those switches, when the door's in either the opened or closed position?