There was a panel near the entrance, which could serve as a door to a toilet room, but there was no knob/handle/etc. There was a sign on it apologizing for construction, but the sign didn't specify what was being constructed (or that it was the toilet that was missing).

Off-topic...
This was our first trip to The Wing. We (the wife and I) walked unencumbered between The Haven (first?) and The Noodle Bar (business?) and back again. Where is the boundary between the first and business portions of the lounge? If first-eligible flyers are allowed to use both portions, what prevents business-only occupants from wandering into the first section. No one stopped/questioned us when we walked from one end to the other and back again.