Funhouse was not acting correctly so I decided to test switches. Quick multi ball is not working and I believe some sounds are not. In switch test mode. All switchs worked except Trapdoor sw45 registered as Steps supper dog sw55. When I unplug the Steps Supper Dog from the opt board on bottom of playfield trapdoor switch shows correctly. Very strange all other switches work correctly. Supper dog and trapdoor are in same row 5. Trapdoor column 4 and Supper dog column 5. I would think if opt board was the issue more switches would be effected. Funny thing is when I play game trap door shot does register correctly. Looking for ideas and thoughts. Reading some blogs I believe the LM339 chips on opt boards need to be replaced at times but not convinced this is the issue.