Do not automatically call a surface mark corrosion; document the finding and assess it against material instructions.
Map the finding
Photograph marks on profile, fastener, hinge and panel joints; add date and container or vehicle ID.
Record moisture, salty load, cleaning chemical and other changes on similar surfaces.
Inspect contacts and finish
Check dissimilar-metal contacts and scratched or peeled finishes under manufacturer care instructions.
Do not intervene with unknown chemicals, abrasives or field drilling/grinding.
Manage repair and follow-up
Confirm repair method, fastener material and protective finish with the model manufacturer or authorized service.
Reinspect the same points with dated photos; record progression, looseness or sealing effects.
If structural or hygiene impact is suspected, leave use decisions to an authorized technical or quality owner.
