I don't think there is much maintenance with slides as long as they are working and in alignment. I check the hydraulic fluid and look for leaks, keep the rails clean and the wipes clean etc. The floor delaminating was an issue with some of the earlier models HERE is a thread that discusses a "preventative" fix but I am not sure how you can repair the existing rotted areas. I have heard of people using everything from sawdust and glue to bondo. I am sure you will get some helpful advice on repairs from someone!
Best Wishes!