When you don't pay attention to small problems they turn into major floor repair

[@elhoward7440]

Wait... the original subfloor is all particle board? Sounds like a bad choice to me. The things mobile home manufacturers will do to save a few bucks... The replacement subfloor is much better quality than the original, other than being patched together in smaller pieces.

[@DougLearn]

Yes a good majority of mobile homes have particle board floors in the older homes. I have replaced and repaired many of them and it is not a fun job. If it gets a bit of moisture now it will hold up much better but still don't want a small leak to be ignored.