Bryant, your issue sounds like a bad super cap or solder joint. Might have been an easy fix. Still would like to know the issue with the LED if multiple units have issues with it.
In the PS-3 world, everything in the tender works off the tender board as long as tender has track power. Either from it's own pickups or from the engine (usual). The engine needs to have good communication with tender via draw bar to work. The boiler board is effectively a slave being told what to do in the engine (lights, smoke, motion). The only thing the engine board tells the tender board is what speed it is going to generate appropriate sounds. It is a two way communication along the data wire. G
