2000 Ody driver seat

I have a 2000 Ody, one owner with 63,000 good miles on it. The drivers seat "back up right" positioning button does not work. I looked under the seat and found what looked like a oil filled tube that bubbled every time I moved the control finger switch. It's located under the seat to the left. I need to fix the seat for comfort. Is this positioner controlled by some hydrualic pump? Has anyone come accross this and how do I fix her up?

Well I don't know about the bubbeling thing, but awhile ago my gf's dad had a similar issue.. Hopefully this thread can help http://www.automotiveforums.com/vbulletin/showthread.php?t=495517