I bought used Giant VT with swinger 4way AIR some time ago. I recently replaced my old frame with Giant. When I was checking the rear suspension I heard clunking noise from the shock. There is no play in linkage. It is noisy when rebounds and the rebound knob does not affect the rebound as it should. So i think some air went to the oil chamber, right? If so, do I need to change all seals (buy a seal kit) or just refill the chamber with fresh oil? Where Can I buy a seal kit for a swinger 4 way air?