Is there a chance that the type of slide actuation is identified? I just replaced the slide motor and put together what was done in a how-to in the repairs/maintenance section. My slide is gear driver rack/pinion type. It opens/closes a large slide. I had the same noise and found the plastic gears inside the motor mechanism were chewed up. These gears had been greased at assembly 22 years ago and were worn and subsequently failed. See:
https://www.keystoneforums.com/forum...ad.php?t=51545