Problem with AX10G's Expression pedal

[CharlieRay]

Hello guys and gals, this is my first post. I just received an AX10G that I purchased on eBay. The expression pedal is flat, just stays down. It will raise up but won't stay up. The seller said it worked fine for him and it must have happened during shipping, but that's the oldest excuse on eBay.
What part makes the expression pedal stay toe up and hold in any part of the travel? I can see two small round indentations on the part of the unit that is under the pedal. Is there a part/parts that fit into these holes that hold the pedal up? If so, I'd like to order it/them. Or am I on the wrong track? Any advice for this newbie? Is this a common problem? Thanks in advance.