Vette94owner

Just took delivery of a 1994 Coupe (our first venture into the Corvette realm)...and loving it) Having an issue wit the lumbar system...when I tested the system it was inop. Upon pulling the passengers cushion, I noteds that the hose on the lower level of the manifold was not connected... I reattached the hose and the system inflates all the bladders with no problem....when I "deflate" the bladders...the hose on the lower bank of the manifold pops off the fitting... .please see the attached photo.....obviously, this should not pop off...is the fitting just worn out? Or do I have more problems than that?? As I said, the bladders inflate just fine...both driver's and passenger's seat...the hose pops off upon 'deflating" bladders. Any help would be appreciated.