Here's what the repair facility said about my slide problem. They aren't sure what the problem is. The gear teeth are fine, nothing else looks out of the ordinary either. They think it might be a burred or oblong bearing/sleeve in the Actuator. Price of a new Actuator is $327.25 and it will take three hours labor to install it at $120/Hr. They offer no guarantee that it will solve the problem. I declined because I didn't want to spend $730 with tax and maybe still have the problem. I'll wait until something breaks (if it ever does) and make a decision on what to do then.