Steven Ayre
You will need to uplift the effected areas, then ascertain why the self leveling compound has failed, dig out the damaged compound, prime the area, then apply new smoothing compound and then adhere new rubber tiles. There is no quick fix unfortunately, any short cut could make the problem worse and once rubber tile start to lift from the sub floor they can become a trip hazard, and you could find yourself in trouble with health and safety especially if the area effected is in a work environment, or worse if it is open to the public.
