Floor Protrusions under tile on 3326.

Hi,

Some lumps under the floor tile of our 3326 seem to be pushing up. They are along the center line of the 3326 but do not seem to be related to the axles.

Ideas??

[B_and_D]

It could be spots of corrosion of the aluminum skin. When I replaced our carpet with vinyl tile squares, I noticed a couple of little areas of "just starting" corrosion near the door. I sanded them down a bit and put an extra coat of the 123 Primer that I used to seal the floor before putting down the tiles.

How big are the spots?

They are not near the door and are about 1/4" high. I would hate to have to pull up the tile to fix them but at some point I may...