Thanks Bubba, shall follow your advice.
I took out one screw last night that had a bit of rust around it, Now i've taken it out it does not go back just spins in free space?? (I think the rust may be more than on the surface.
It seems to me the refrigeration unit and floor pan would have to come out so I can get to the rust - unless there is some quick fix I could try with a rust converter?
Is taking the refrifgeration unit out something a novice could do?
Also does the floor pan come up very easily?
(is that ordinary putty in the corners or some special adhesive?)
Sorry for so many questions

)