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i think scoobyclinic supply ast's (used to anyway), so may have info on rebuilds/overhauls. i'd guess its an rtm overhaul on them that will be required, but give ads a ring, sure he can advise on the best course of action.
I mainly do Ohlins, Proflex and Reiger but have had AST's in before. If you are stuck for someone to have a look then give me a shout. I am in Rugby and will PM my number if you need it.