Having issues with the 3 ball lock. Every now and then when I get all 3 balls locked the game goes into ball search. All switches work in switch test but as I stated it only does it now and then. I'm guessing a failing switch. Looked up the numbers for the switches are used in this area but can't find any for sale. Has anyone changed theirs and know what part number I can get? Since I don't know what switch it is I just want to replace all 4 switches in this area.