Thanks for all the replies.
i bought a new shock for my 675R. Then sold the bike and got a high mileage 765RS.
I had the rear ohlins rebuilt by ohlins thailand. They said they recommend a rebuild at 40,000km.
my bike had 65,000km on it when i got it. The rear shock failed at 72,000 ( it no adjustments left. Extra crappy ride). It was not leaking.
greatly improved ride.
i have since reached the stock shock limits and have ordered a ktech.
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Ohlins 765RS shock video click to view.