Rust spots appearing on front of doors of kitchen... Hello there. I am interested in finding out

Question

Hello there. I am interested in finding out the cause for the rust spots appearing on the front of the doors of my Kenmore Frostless refrigerator. It's about 15 years old and appears to be working well otherwise. Last serviced about 2 years ago. Please post and e-mail me ([e-mail]) your thoughts. Thank you. I've got a six-year old top-freezer Kenmore that's covered in rust spots on the doors (Model 106). It's never needed servicing and it still has the original light bulb! Could this be due to bad insulation? Really? Only 6 years old?