I have a mouse problem right now in my 2014 21’. I’m trying to figure out where they are getting in. The trailer has spray foam on bottom so it’s hard to see potential entry points. Is plumbing (1 fresh, 2 gray drains and 1 black drain) the only holes in the bottom or are there other spots mice could enter? I just can’t see them being able to get up the smoother sides to the fridge vent area. Thanks!