Forks squeaking!

My Dirt Jumper 3 forks are squeaking. They just started for no apparant reason. They do it as the fork legs get pushed down. How can I fix this?
Giant XTC 2.5 '08
Felt Virtue 3 '10
Giant Defy 2 '11
Giant Terrago Disc '07 - Convereted for CX
Fit Team Park Bmx '08
Felt Virtue 3 '10
Giant Defy 2 '11
Giant Terrago Disc '07 - Convereted for CX
Fit Team Park Bmx '08
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or it might just be the valves working?
Parktools :?:SheldonBrown