I hadn't thought of that possibility, and I'm glad Mandy mentioned it. If your '05 is like our '06, the bleeder valves are mounted on a plate with the remote air hose connector next to the battery box behind the rearmost curbside access door. It could be as simple as one of those bleeder valves having been bumped slightly out of position, debris jamming it, or as Mandy suggests, one has a bad seal. The hose connector could have debris jamming it slightly open, or a bad seal, too. It would be a simple thing to initially check before going to a service center.
Joel