I left the coach this morning and locked the door's dead bolt. Upon return, I unlocked the door (deadbolt) but the handle would not open the door. I can look through the driver's window and the door's air lock has engaged. How that happened I don't know; I'm the only one on board and have no pets that could have engaged it. Is there any thing I can do to disengage the air lock, I.e. drain the air line or the tank? Will that even work?