Stuck Retarder switch

[cudjoekeytom]

Just picked up my 91 WB from the Detroit Deisel Allison shop in
Orlando (pretty bad experience overall). Still have a Check
Transmission light on although they say ther are no active
transmission or engine codes (they checked with their handheld
device). Their story is that it's probably a short in the wiring that
is causing the light to come on. I'm suspect at best.

Spoke with Bennie at BB today and asked if stuck retarder switch
(stuck in the Apply position and the "On" light is not lit) might have
something to do with the check trans light. He plans to speak to a
transmission engineer on Monday and let me know.

I'd like any input that anyone might have on the subject and also like
to know where I can get the switch to replace the one that is stuck.
I live in the FL Keys so mail order or internet will be th best
sources for me.