We had a hole in our sofabed air mattress made by Villa International, which they replaced. Joyce told me to call them to determine if they wanted the defective part returned, so I called Robert and in the meantime I wanted to check out their website. While we don't need the modification, I know some of you are interested in more sleeping space. They've done a mod that allows for 5 people. Here is the link to the website page:
Hope this helps someone!