There seems to be a film of oil around the rebound knob, its not dripping but it seems to have weeped or is weeping, the shock is 4 months old and has done around 300 miles or so, has anyone seen this? my sisters RP23 died twice recently but that just peed oil out in bubbles. I was messing with the rebound two week ago when i first noticed this since then its just got a greasy feel about it. any advice or should i send it back where i got the bike? Sorry if this has been covered already.