Mine leaked there when i wiggled the white thing. I got a new valve from somewhere iirc.
servo cracked at the mount bolts A few weeks later
A bit of ptfe gas tape around the grommet then a bit more round the valve when you push it in worked for me.That sounds about right, show them some love and they just take advantage!
Spotted a servo NRV on ebay for £7.23, if you dont mind paying £74 postage. (There are lots more.)