Run WMIADAP /F and WMIDIAG tool

Hi,

Strange one.  SCOM 2007R2 rule that runs if SCOM thinks the WMI reprository is corrupt Run WMIADAP /F runs daily on a couple of our Win 2003 Server boxes, however if I run WMIDIAG (MS tool) there says there is no corruption.

So why does SCOM think there is?  Any idea how it checks?

Thanks