I wouldn;t waste my time worrying about this, checking easements, or
anyting else. Cable companies pull cable every day. If they damage
something, they will either fix it or pay to get it fixed. And what
are we talking about here? A cut lawn sprinkler pipe? That can be
quickly fixed in 20 mins with a spade, a short piece of pipe, two barb
fittings, and clamps. The less involved you get with the whole thing
the better off you will be. Start talking to your neighbor and you may
be in for a lot more trouble.