I got a used top mount water cooler from a family relative. The water bottle collapses after dispensing water and I have no idea how to fix it. I can’t find anything online other than a video showing the same symptom but no advice on what do to. I’m thinking it has something to do with a relieve valve of some sort but I don’t want to go tear the thing apart without knowing what I’m looking for. Anybody experience this and deal with it before?