Question, bought my son his 2004 GT and the drivers side as the lumbar support ran by the electric switch and pumps up. It swells up and then in just a minute or two she goes right back down. Obviously she has a leak. Before I go to the stealership I would love to know what is common problem and can this be fixed as I'm very good with wrenching and just like to know.... any of you been there and done this? Thanks much............