The replacement: Carefree R001651 Marquee Over the Door and Window RV Awning 12V Tubular Motor with 3-Slot Roller ($137)
The old motor fails. Trent helped me to replace it today.
New Motor
However, when we were trying to adjust the awning after the new motor is working, we broke one of the arm of the awning.
So the next fix will be replacing one of the arm.