No, you will not be covered for the top part of the case. Unless there is record of what he did (which it sounds like he was doing you a favor) you are out of luck.
I really doubt that happened though, sounds like you are trying to get something for nothing (even though he already gave you that when you helped you).
Like I would take pliers to my own laptop...
Just looking for a little empathy here. I guess not.
Why dont you sue anybody that has come within 10 metres of your computer? Most Americans do it all the time.