300/440/550 87' 650 SX Rattling noise??

When I start my 650 sx on the trailer/stand, i hear quite a bit of rattling come from the back of the ski. I looked under there, and couldn't really see anything moving, so I'm assuming it's inside, perhaps a pump issue? or bearing? it just sounds like metal rattling around. any ideas? Do these skis need their pump oil changed? i know my seadoo does, wasn't sure if these have the same pump cone, etc.
 
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