Problems with solids

Hi there. I use SketchUp Pro 2024. Reasonably experienced. I have created a solid which I believe has no holes, loose edges or internal faces. It was created after subtracting two solids and some additional work after that. I have zoomed in and looked closely at all edges. Applied Solid Inspector without success. The notification is “Surface borders”, however does not highlight where. Is there any other tool to inspect solids? I have tried Fixit 101 also without success. Appreciate any help. Attached the file, hope it will upload.
Testing.skp (7.3 MB)

Use Tab to get it to show you the error.

Thank you very much. I did not know that. I will try to investigate further.

Read what it says on the bottom task bar while tools are active, this tells you what modifier keys can be used etc…

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