Yep, I did something stupid and it was an absolute pain to fix. When you replace a fuse, double and triple check the fuse size to make sure you are putting in the correct fuse. Double check the manual.
Over the past few weeks I've been upgrading my White Water with LEDs, different mountains, and different ramps. I shorted out something in the machine and blew a fuse going to the CPU board. No problem, I've got one right here! Put the new fuse in, it blew again. Spent 4 hours finding the short and put another fuse in. The fuse didn't blow, but I had some strange problems, the triple pings of trouble, and about 8 hour codes. I finally realized I put in the wrong fuse (a 1 Amp instead of 750 mAmp), corrected the issue, and put in about 12 hours checking every damned wire in the machine for shorts. In my desperate low-tech troubleshooting I unpugged each connector 1 at a time even remotely associated with my errors, and found that 1 connector on the CPU board had issues. Eventually through some help here on pinside via the Whitewater Thread thanks "urbanledge and yaksplat"! I figured out a switch matrix IC chip was burnt out (shown in red in the picture). This was only about $5 in parts, but my heart stopped and I spent about 16 hours figuring everything out. I 100% did this to myself. I am lucky it didn't do any worse damage.
On the upside I have a fully working machine now!