"theonyxguy" wrote in message

a) could mold smell like that, from not having the dryer vented, even
though we open windows and turn on a fan.

Yes, it could still be building moisture and mold.


b) moisture could smell like that, from possibly a leak in the roof
running down the chimney

c) could it be the drain from the washing machine, but shouldn't this
smell more like sewage rather than urine. (There was a trap
installed)

You'd think so, but could there be a leak and mold forming? Could the hose
leak a bit where it goes into the drain?