mc-9 crusader 1989 sudden air leak on air suspension height control valve

[tombuchanan]

I got a sudden air leak on what looks like a control box for the rear air suspension.  From the manual, it looks like the air exhaust port on the height control valve.  In the picture, it's the yellow port on the right.  This is located in front of the rear wheels by the suspension on the passenger side.  I think it started blowing air right after I took it off kneeling position.  I drove it a little and it kept blowing air so parked.  Any ideas as to what is going on?