interior stains on ceiling

[DONnANNIE]

I realize you are over the one year warranty, but I would try your dealer. I had the same problem,(under warranty) and the dealer cleaned it up for me. I was told that it was excessive glue leaching through the ceiling. I don't think I was ever told what they used to clean it up. As I recall, this issue was discussed several times before, perhaps you can "Search" and find what to use on the yellow stains. Good Luck.