I don't have your answer, I just like to post all over the damn place
I will tell you some interesting stories related to your post though...
My passenger seat was acting up.. occasionally it was moving backward but not forward, really irritating cause I like to keep the center armrests lined up so I use them both.
Anyway, I was desprately looking for something and happened to search the seat tracks -- I found my son's camping knife wedged into the track, out of normal sight, stopping the seat from moving forward. Problem solved.
Mr. Nailfoot over at LOL had a problem like yours, he found the problem was the joystick control on the door was bad... it worked sometimes, then died. He also heard the motor spinning. I don't get that part, but that's what I heard.
"....they say the whole track needs to be replaced...."
This reminds me of a post I've seen recently where a guy goes to the dealer and says "I want to connect my cellphone in my Town Car where that carphone goes.." The dealer say, "no way buddy their two different systems, analog vs digital, etc".
Of course he didn't give up on the idea and later came up with a bluetooth setup that connects to the JBL system the same way the carphone does. I'll stop telling people "no way" too
The moral of the story, if there is one -- there's always another way