Hi Friends - I've run into an issue with an S+ that a friend gave me to get running for him. I just today noticed that the coin lock wasn't working at all. I check the coil and it's open. Then I tested the AC supply to the coin lockout coil, and it's always on. I connected a 28V lamp to the supply for the coil - so I could see if there was any flicker when coins pass the through the coin detector / comparer. Solid lamp all the time. I pulled the CPU back out to find Q16, Q17, Q18 all have low resistance across Input 1 and the gate. There are MAC3030 thyristors. Q 16: 39 Ohms, Q17 58 Ohms, Q 18 67 Ohms. None appear fully shorted, and testing thyristors has always been sort of a guessing game for me. I'm curious if anyone here has feedback on this issue. I didn't want to cut one off the board if it isn't necessary. These aren't expensive , so I can order some to see if new ones make any difference. But I was hopeful someone here would / could shed light before I go that route. Thanks!