Guns,
As we discussed before, Lionel did not make these FT Switches LED operator friendly, the LED's are suppose to last the life time of the switch, which many don't, they were not made to have the owner/operator just replace the LED. Pain in the back side, replacing the LED switch side light by itself.
I've replaced the LED in a number of Fastrack switches, that's no sweat at all, it's really not that difficult. As far as the controller, it's basically impossible for me to believe it can't be replaced. I haven't had the occasion to open one up, but I'm sure I could replace the LED if I had a bad one.
It's a minor pain, but it can be done. Basically, you just unsolder the bad one and solder in the new one!, observing correct polarity, of course.
I had one switch where I wanted to reverse the red and green so that "out" on the switch was green on the controller, so I reversed the red and green LEDs in the controller. (Actually, I designed a circuit to do it electronically but a certain weapons smuggler didn't approve and talked me out of using it...)
The LEDS in my controllers, which are 6 or 7 years old, are wire lead LEDS. There are two lamps of each color in two different sizes. The hardest part is cleaning the holes out so the new LED leads slide through. It is greatly simplified with proper de-soldering equipment.