1917-1911M

2006 F 150 4x4. I'm planning on selling and want to fix the one issue the truck has. Neither outside power mirror works quite right. They jerk and jump or don't move at all. I don't know if the problem is in the switch or something that needs cleaning or lubing inside the mirror. A search shows nothing.

Ideas on what to look at and how to fix? I can press the mirrors in at each corner and something makes a ratcheting sound. If the motors stop moving it, pressing in on one side makes it move by the inside control but not well. Thanks for ideas in advance. M1911