It would be extremely useful to see how the tests failed - for example which element was not accessible.

Repositories to add:
ezplatform (1.7, 1.13, 2.2, master)
StudioUI (1.7, 1.13)
Page-Builder (1.0, master)
AdminUI (1.2, master)

Proposed approach:
Use https://github.com/Lakion/MinkDebugExtension
Set it up with imagur, encrypting the token.

Note: It's also worth inverstigating whether the page source can downloaded and uploaded for easier investigation.