Have a set of Dual air Revs (2012) and have noticed that over a week or 2 the amount of stanchion showing decreases (measured).
I set them up with about 85psi +ve and 75psi -ve. It's as if the two air chambers are equalising or something.
No change in performance as such, but 5-10mm less travel after a few rides & releasing the pressure from the -ve chamber restores the lost travel.
Interestingly I have another bike with the same model fork and year but I leave that for weeks between rides and nothing changes - probably only check the pressures twice a year.
So can anyone advise exactly what to check.