I recently bought a 3rd Rail PRR Mountain from a forum member. It arrived perfectly and ran just as well. Tonight while running the engine the tender derailed. Ever since I can not operate in TMCC mode. When I power the engine I immediately get sound as if it is in conventional mode. I did a search and in previous posts members wrote to check the antenna and the boards. The boards look ok (not loose) but not sure what to look for with the antenna. I tried reprogramming the engine but without any luck.