Here's something I found with a Google search. I have NO idea if it's relevant to your situation.
After your refrigerator starts leaking, it will eventually (usually very soon) stop cooling. The worst thing you could do at this point is to delay getting your refrigerator repaired because corrosive ammonia is eating away at the cooling unit steel (ammonia doesn't corrode the steel while it's inside the cooling unit because of the rust inhibitor inside). The longer you delay getting your refrigerator's cooling unit rebuilt, the lower the odds are of a successful and reliable repair. Also the ammonia gas will eat up the inside of the cabinet and the parts. The light and thermostat will need to be replaced if left too long and the inside plastic will turn yellow. You can see why removing all rust from the cooling unit by sand blasting and rust proofing the cooling unit are essential steps in a proper cooling unit repair. Just as with your car, if you don't remove the rust, it'll just come back and, after another season or two of use, the cooling unit will fail again.
Here's the full article: