For further investigation I might put down some thing lack of sleeving on switch lines for example.
I've read this recently but can't remember where.
I fail to understand how this would require further investigation unless you intended to rectify.
If I come across this on a visual inspection then I would simply assign a C3. It fails to present danger in my opinion and I don't see the point in removing all switches and luminaries to put right.
When removing a switch its clearly obvious to assume it consists of live parts / cables.