Does sound like something may be stuck in there unless one of the cables has come off one of the pulleys. If that is the case you gotta wonder what caused it. As you can see there isn't much to that system except the motor, cables, and pulleys. Those two connectors should be moving and passing each other as the slide travels out and in
That's a shame they cant get it checked out quickly since they just had it in the shop. Be sure to post what the problem ends up being as I'm curious as to what could be causing that. Was hoping those cable connectors would be an easy fix for you.
2014 Georgetown 351DS
3 Boston Terriers, 1 Frenchie
Gonna miss you Toby. RIP