Removed my Audible Illusions Mod 3 from rack after 16 years and feet have turned to goo

My system was in my 14x25 medium room in my basement. So the temp is not hot or to cold . The transformer coil was on spikes . The main part of the preamp just sat on the rack. I think it all depends on the the product used by the manufacture . I have other 
pieces of equipment of same vintage and no problems with the feet.