Simple and to the point.
If something we installed breaks because of us or our craftsmanship, we fix it for free. We have decades of experience in what we do and take pride in our work. So if a cable we installed doesn’t work, we fix it. If an ethernet port we installed breaks, we replace it. And if we can’t fix it, we will make it right.
That’s it. No 20 page legal document pinpointing everything that could possibly be covered or not covered. If it breaks because of us, we will take care of it.