Hard to say, sometimes they just fail. Without looking for clues in the locomotive, I really can't say why it would fail. My first step would be to do stuff like check the smoke unit condition, and closely examine the wiring between the smoke unit and the TMCC motherboard. If you get a random short to ground (pinched wire, etc.), that can take out the triac, and they frequently fail shorted. Once I know the smoke unit and wiring are OK, I test the R2LC and replace the triac if possible. I'm guessing before the smoke unit is "OK", you are likely going to have to do a little repair there.
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