Delamination

Well I can't speak for your situation, but I had a similar with my AF all within its first year. I noticed a spot by the oven vent about the size of a ball of an ink pen. I kept my eye on it and in about a year it grew to the size of a grapefruit. The dealer I purchased from took very good care of me and contacted the manufacturer with photos and a trained discription of what the situation was. The manufacturer let me use my rig the rest of the summer since that is why I purchased it. Over the winter they took it in and did a full wall replacement all under warranty. I couldn't be happier with the service that I received from both the dealer and the manufacturer. While it was there being worked on the manufacurer contacted me several times keeping me up to date with its progress. I learned a very important lesson with all of this. That is that everybody has a failure now and then. It's how they deal with the failure that makes the difference.

I did mine all under the manufacturers warranty prior to it expiring. Today the unit is another year plus older. If I notice a failure now I think it would be on me or my extended warranty / insurance company. I wish you my best and hope you find a solution to this situation.
Dan Bamrick