My light engine just seems to have died. It started to flicker a bit and then just died. No dramatic smoke or burnmarks (smells) anywhere. I haven't opened the light engine but I have repositioned the light engine. I was using a r123 when it died and I've tried different bodies 1.5X123(w/17500), and 2X123(w/123 primaries). I've also tried just making contact with the Le in the battery tube and nothing wants to light it up. Any clues?