Leaking Grohe 19925 Cosmopolitan Square PBV

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Rob v

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This Balanced pressure valve is an integrated two way diverted valve. I just installed into a GrohFlex universal rough in valve.

After opening the service stops and turning water on to the shower head a small amount of water drips came out between the water flow lever and the select lever.

Where would this leak be coming from ? Do I need a new valve?
Should I pull that valve from the rough in valve box and reinstalled adding more o-ring lubricant.
Would it be leaking at these o-rings?

I have attached a picture of the valve.

Any help much appreciated.
 
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