You might look at the gear teeth the drives the rail. My full wall slide broke a tooth on the front rail. The factory replaced the whole rail/motor assembly. About $1300.00. They said some dealers replace only the gear, but their experience has been it fails again soon.
Dan & Sharon (Zena-Our Yorkie Puppy)(Kasey-Our Yorkie Puppy RIP 9Jan05-26Jul17) On the Road (2012 Journey 36M, 2020 Chevy Equinox)
USN-Ret ('65-'93) Fulltimers, Class of 2012