See this thread for discussion on the car window motor replacement-
Cheap LCI awning motor replacement
Also you can go to Ebay and search Dorman 742-141
and the top hit is one for $31 incl shipping!
(I've printed this info and placed in my folder of important papers in my trailer!)
Read the thread carefully- you need to finish drilling a hole in order to put a punch
or small screwdriver in there to hold the spring while changing the motor.
It's all in the thread just proceed with caution!
Also this thread- covers how you might recover from an awning motor failure
while it's out and you need to close it to go home/to the dealer-
What to do when awning motor fails?
We'd love to hear a follow up someday.