After shopping out my TZ (specifically after changing the rubber rings on the mini pf), my machine started to flake out. At first, it was resetting after a few seconds of play or when both flipper buttons were pressed at the same time. After a few power cycles, I got the "Check Fuses F115 and F116, J112 and Opto 12v Supply" error. Fuses looked good. A switch test revealed that none of the opto switches were working. Next I started checking the voltages on the power driver board. the 12v and 5v test points were registering double what they should have. When I touched my multimeter to the 20v test point at TP7, the machine went nearly dead; all insert, GI, backbox lights went out and no DMD. Only a couple of my mods stayed lit (Robby and the mind orbits shooter rod). I cycled the power and still everything out. Then the speakers started to emit high pitched static. The volume starts off low and gets louder and louder very quickly. I thought maybe just my opto board was fried but now I fear the whole machine is toast.... any help would be greatly appreciated.