I am getting an error message that says "Diverter stuck open". When I look at the playfield, the diverter looks closed (not blocking lane). When I run the solenoid test, the diverter does not move during test. But I can move it with no problem by hand, so it is not sticking, but when I do move it by hand, I can feel the solenoid kick in and hold the diverter open till it cycles to close.
What is the best plan for attack to fix this problem? Any ideas?