I had the same problem with the awning on my 2010 252fwrls "Copper Canyon" 5th wheel. The motor got more and more sluggish over time. Got to the point that it would slowly roll out, but the electric button only unlocked the motor so you could manually roll it back in. Replaced the motor with one from an ebay seller and the problem is fixed. There are videos on youtube.com that show you how to change the motor, adjust the spring, replace the fabric, and all sorts of awning maintenance activities.
Took my adult son and I about two hours to remove the awing from the RV, place it across a pair of sawhorses. Drill out the rivets, remove the old motor, insert the new motor. Rivet with aluminum rivets, reinstall on RV, rewind the spring and reattach awing to arms. (The arms stay in place on the RV). Was much easier than I expected.
The hardest part was identifying exactly which awning motor I needed to order. So I did the removal and disassembly first, then I could see exactly what to shop for. Took a week to get the replacement motor. Summary, an hour to take down and disassemble, then a week later an hour to reassemble and install
. Did not count the five hours trying to figure out just which motor matched what I needed.