A couple thoughts. The arm that kicks the ball to the shooter lane, if it's anywhere near the arm of the last switch, bend the kicker over a little so it isn't hitting the switch.
The shooter lane switch. The green wire and what ever color stripe. There is a micro mini switch under the playfield, left rear corner. Two wires of that color into a connector pushed onto the switch. Be sure those two crimped wires are making good electrical contact inside that connector.
LTG : )