I purchased a 2010 Flying Cloud 19' this week and only today noticed some yellowing on the cabinetry, wood surfaces and even the mattress. I attached some photos I took today. I actually think the iPhone makes the yellowing look more significant than it actually is, which is why we did not pay so much attention to it during the inspection process. However, we still would like to understand what is causing it.
In general, it looks like this forum points to either significant age (i.e. trailers from the 70s) or tobacco smoke as causes of yellowing. Obviously age is not a factor. The owners I bought from are trustworthy and say they did not smoke inside. They don't know much about the previous owners, but nothing else indicates heavy smoking (no smell!)
Any ideas on what could be causing this?