Several bubbles in the aluminum sides of the Sahara where it meets the stainless steel basement doors. Once you start picking at it, the paint needs to be dealt with. Not a great prospect on a 24 year old rig.
The one area I did pick at I wire brushed and then hit it with a coat of paste wax. That seemed to stop the corrosion. If you camper is white the contrast wouldn't be noticeable.
I just inspected a motor home that had a handicap access door installed. It was aluminum with steel parts attach. The entire bottom of the door was corroded.