[Zope] Leaking ZClasses.Method.MWp

Hi All, It looks like my Zope instance (2.7.2, patched cAccescontrol) is leaking ZClasses.Method.MWp classes Acquisition.ImplicitAcquirerWrapper 2047 100751 +98704 ZClasses.Method.MWp 8544 34185 +25641 I can't figure out where this class is used in my application. I even can't find where this class is located in the zope sourcecode. Greetings Ralph