I done the same thing. Listed down 2 Examples for Each of the competencies.
Personal Awareness, Personal effectiveness, Leadership, Partnership working, Job knowledge and Effective Communication
The probing questions were not so hard to answer because they usually referred to your thoughts etc.. so just think back to the situation and be honest.
Also worth highlighting that I was under the impression that Effective communication was tested just throughout but In the final Interview they also asked a competency based question on it!
This was something I did not prepare a example for but luckily I was able to think of a time where I used effective communication on the spot which I wouldn't advise.