@Dennis Rosenthal, it's been about a day now, have you discovered any new information? When you say both engines are "...dead...", what exactly does that mean? Do they light up at all when power is applied to the tracks? What led you to believe that the e-unit on the 675 is bad?
Frankly, I believe @bigkid is on the right track - Pullmor engines that don't have any electronics (TMCC, electronic e-unit, etc.) are pretty danged hard to burn up! Open your engines and troubleshoot with your eyes and nose - is anything burned?
