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I had one with a slight leak the other day - had problem with same one about a year ago.
If you skwirt the WD40 it will probably bubble around the nut if the leak is there. If you are going to try tightening it be very careful. Torque only 8 Nm. I sprayed WD40 all over the threads then nipped up bit a at a time until no more tell tail bubbles.
If you overtighten it you can snap the valve from the monitor body. Valve could well seal - but monitor body will be rolling around in your tyre - effecting the balance and I guess monitor won't like it.
Currently in ns.thomson's garage:
Rover in Garage, Grande Espace 2.2 Initiale on Drive