Working on a Rescue 911 that continues to blow the switch matrix fuse. F6. Having eliminated the driver board connectors, the fuse now holds. Tells me the problem is on the playfield. However I'm trying to narrow the short, or what kind it could be. Any guidance would be great. As we cannot seem to actually step through test menus at this moment. I have my DMM out. Wondering if there is a way to test line voltages and look for a spike? A3P3 and P4 are pulled from the driver board and the fuse holds. Does this point to the playfield? Or is the Board still in question? Thanks.