Don, first of all welcome to the forum.
When you open your compartments and take a look you will notice that many of them have a blank off plate at the top so that you can't see all the way through the compartment to the other side. FR is big on hiding the inner workings of their rigs. If you remove these covers you will see the hydraulic rams for the slides. You can then lubricate them with silicone lube. Do not use oils like WD40 as they will attract dust and hold it. Only use a silicone lube, it is available at Walmart for a much better price than Camping World.
A few of our levelers tend to make the same squealing sound at times but it's usually nothing to worry about. Do your slides seat O.K. when in and out? Do your decals or paint lines line up when the slides are closed?
Also I have noticed that even though most of the slide hardware is double nutted to keep things from backing out they have worked loose on ours so check all the stop nuts and adjustments to be sure they are still solid. You can find a manual for the slides on Lippert Inc. web site for these slides for more information.
For the bedroom slide (if you have the 378) there is a thin wood panel under the bed that once removed reveals the ram and mechanism for the bedroom slide.