Bruce Almighty

I have seen some leaking from the vent of one of the main pump. It was producing some pretty big blocs of ice. I have removed some foam on the rigth side corner of the service panel to try and see where it could come from, it seems to be comming from the hose attached at the base (back) of the vent exit. Also the wooden frame in that section is soaked (but not the foam??) But since I have opened up, no more leaking . I would like to know what is that hose and where it goes (or comes from) in order to dig in more. The leak as stoped since the temperature have been above 0 deg C (or 32 deg F).