I was attempting to reset an engine that is locked in forward using the horn/bell combination using the Z-1000 in conventional mode. The engine derailed on a switch and shut down. I don't think the breaker on the transformer tripped. Now when I apply power, the full voltage is applied to the track and there is no adjustment using the speed control. I looked inside the controller for any obvious burned spots on the board but nothing obvious. The board looks fairly simple and easy to get to components if I knew which to replace. Any ideas on how to further isolate/troubleshoot?