I didn't want to start a new thread for this subject since it has been covered in multiple posts. I just rebuilt an Addams that I have reinstalled the playfield and have fired up. Everything is working with the exception of the error on startup of check bookcase optos, 53, 54, 55, 56, check Thing up and down. I also believe that the bumper lane opto #57 is not working. On the 7 Opto board, the LED is not lit, but I do have 14V at J3 pins 1 and 2. But I am only reading .520V at J2 pins 9 and 10. I confirmed with a camera that bookcase optos are not working. Does this sound like the board has failed or something else? This game came in with CPU acid damage that has been professionally repaired and the power/driver board was gone through at the same time. I can't confirm if Thing and the bookcase worked upon arrival, but I do know that there were a ton of standup switches, etc., that did not work.