Back when worked at Time Warner, we never charged for a truck roll that I'm aware of. Not unless you did something stupid like cut the main line to the house with a garden tool, or you request an additional outlet to be installed in the wall.
While I don' know, I'm pretty sure they're no fee in swapping the box out in person if the TSR agent states it's ok to do based on a technical issue. But for a truck to drive a box and install it to your home, yes, I can understand the delivery and setup charge. Now if a squirrel chewed through an overhead coax line, well that's their problem, not the subscriber's.