he was referring to the engine to 6 screws and take top off! he suspects problem in your engine wire harness to resolder connections as there were common issues with cold solder connections!headlight is powered by the boiler board in the loco. The shell is removed with 5 screws, one in the stack, two at the back of the cab, two under the rear truck next to the firebox bulb. Check the connections at the boiler board and the wires going to the heat shrink tubing at the LED headlight (poor solder connections are common). The firebox bulb shares the same power source as the headlight, so check any junction of the blue (typically) wires.
Alan
