On my Bally power play, the wrong feature lights light up but at the correct timings. So for example, instead of the feature lights for the bumpers switching between each other on each hit, the special lights alternate between on and off. I had a similar problem with the solenoids mixing up, and it ended up being the U11 chip. I was able to test it using my logic probe. But I'm currently unsure which chip may be at fault here. Another issue that persists is the machine occasionally will not boot. The lights turn on, but the mpu does not always pass each flash test. When I try again, sometimes the same issue persists, but sometimes the machine will boot and operate correctly (other than the mixed up feature lights). Any ideas? Sometimes the machine will also quit working altogether in the middle of game play (usually right when a solenoid fires), and then will reboot immediately. But this does not happen when I run the solenoid test. Also, occasionally the feature lights work as intended, but it will switch back and forth between proper operation and improper operation. But for the most part, the feature lights stay mixed up.