"Off the wall Y-connectors"?
Until we hear more from the Estates Department, I'm guessing something along the lines of:-
Localised leakage due to a faulty Schrader valve. Possibly due to age (worn out), dirt, a damaged (or partially inserted) probe ... or "even" lack of attention by nursing staff ("failing to notice" etc.).
And, to be honest, "plastic" Schrader valves does not sound like a good idea to me. Unless, of course, they are designed to fail ... with a life limited to just so many probe insertions (or whatever). Maybe just a plastic collar.
In any case, I would suggest that simply identifying then removing the offending item would be the most prudent course of action.
By the way, periodic inspections (checking) are a good way of catching (minimising) such issues early on.
