I'm stuck. I can't seem to work out an ethical solution to a particular problem
Problem:
My lead Tech made a mistake which caused a major outage across our property.
I spent 6 hours on the phone in the middle of the night to our VP trying to get it sorted out.
The root cause (mistake) was not brought up or discussed during that time.
I confronted my Tech about the mistake, but he was unaware he had done it
The engineer responsible for the system called me this morning, saying that I would have to explain what happened to our director
I will do so as soon as he gets in
Dilemma:
If I tell my director what actually happened, I feel I would be sandbagging my lead Tech
If I take full responsibility, it will appear to my director and VP that I had hidden my mistake from them previously. (Whenever I make a mistake, or cause a mistake to happen, I immediately admit to it.)
I could say that I take responsibility as the person in charge of the shift, but that seems to be a bit of a cop out. I'm sure they want to know who actually pressed the wrong button.
If only I could pray for some guidance

In lieu of that, does anyone here have a clear ethical view on this?
Note: Not looking for an easy way out; just the correct way to deal with this
Thanks to all who respond. -BoF