I have a special run version of the 2231130 (2231670) and it has started running 18 inches and stops with the single flash cab light. this is supposed to mean a drive motor overload, but I can't find anything. I have turned the flywheel by hand and don't feel any drag or extra friction as it rotates. since I don't know what current is being sensed, I disconnected one of the smoke units and it did not make any difference. Does anyone have ideas on what could be causing this overload situation? Thanks in advance for suggestions.
Here is the locomotive:
Here are shots of the internals:
From above - you can see where I disconnected one of the smoke units (grey connector)
view from the side