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Stefan Senegeac 6Stefan Senegeac 6 

Cannot delete SOME of our own managed classes

So I got the permission to delete managed components from SF Support. Problem is I can delete some classes that are part of our managed package but not others. 

I can't see the 'Del' Button in the UI and in the Console I get a message box with the error: 'insufficient access rights on object id' with the title 'INSUFFICIENT_ACCESS_OR_READONLY'. 
Support says it's a referencing error (classes being referenced by others) but now I'm a situation where I can't delete any of our managed classes.