We have a 6 month old 2022 Sundance 293rl and now since dewinterizing ( in NH) there is a musty smell in trailer. Tanks were cleaned and flushed but I did again but smell returns. Made sure to use flush system to make sure the tanks is clean. But I am told by wife that smell is still there. I went to roof to look at vent pipes and the one for the black tank is very low down and actually offset from the vent cover opening. I think that the smell is venting and some of it is getting into attic and lingering. My question is how is the vent pipe attached to the tank? Did it slide down because it is not properly fitted to the cover? Can I pull it up or should I try to lengthen it and either way should I seal around it to prevent smell from getting into attic area. I have read other posts on here of smell’s traveling back down into trailer.