As I am assembling my brand new Jet JWBS-14SFX (S/N: 2018070504) and discovered a I couldn't get the fence to be parallel to the blade without wallowing out the fence rail mounting holes.   So I took it apart and gave it a more through look.   There was a white powdery substance that appears to be corrosion on the fence.   The fence consists of steel lock bar, and aluminum parts.   I attempted to remove the corrosion with WD-40 and turpentine which helped but it still looks and feels rough.   I can probably sand it flat, but, I have a Kreg fence, which I like, so I'll use it instead of the factory original.  

The fence body from a distance.   You can see a little discoloration around the two holes.

Closer look at the fence body corrosion.

The corrosion was less on the fence body near the fence guide.

Corrosion on the resaw fence.

Some of the corrosion can be seen in the threads of the lock bar.

The other side of the lock bar threads.

Thread on the other end of the lock bar.

There was apparently a slight bit of rust on the underside of the lock bar.