Okay, we don't call them minors and majors anymore, do we?
During your ADI Part 3 training, you'll have been made aware of how to deal with driving faults and how to deal with more serious or dangerous faults during your lessons.
Whatever your learner's existing lesson plan is, it must change when you encounter a "safety-critical" incident - the definition of which is; anything that would result in a test failure - a serious or dangerous driving fault.
Failure to adapt your learner's lesson plan because of a serious or dangerous fault, will always result in you failing your ADI Part 3 exam.
The issue I see for many PDIs is - despite passing their own driving test and the ADI Part 2 exam - they really struggle to see what a serious/dangerous fault looks like, or whether it would actually just be a driver fault.
This also makes it really difficult to conduct a realistic and accurate 'mock test' for a learner who is approaching their driving test.
If you feel you'd benefit from a training session on how to classify your learners' faults as 'driving faults' or 'serious/dangerous' faults, let me know and I'll be more than happy to help.