Here's one for the archives and maybe an FYI for 3G and the Gunrunner.
Was watching my PS3 Hudson rounding a curve last night when it suddenly slowed and began to make a what I can only describe as a mechanical sizzling noise. My wife was in the room and said she saw smoke coming from the bottom of the engine so I was thinking "great", a fried circuit board 
. But when I removed the shell from the engine I couldn't find any evidence of circuit board damage. Did find a loose screw on the tender attach post, fixed it and the engine ran fine without the shell. Huh, wife must have been mistaken about the smoke. Put the shell back on, same noise and the engine went about 1 inch before the breaker on my layout tripped.
Took the shell back off and -- aha! -- the epoxy that was used to anchor the wires to the LED cab light had failed. The wires had dropped down onto the top edge of the flywheel tape which abraded the insulation and shorted the wires on the flywheel. The fix was to e-tape to repair the insulation and then use some copper foil tape to anchor the wire. All better. 
Photos below.
