We don't have a Castle Pines-specific price list to quote you here, and I'd rather say that than make one up. What we can tell you: Castle Pines households have the highest median income in the areas we serve out of Aurora - $189,918 - and homeowners here tend to ask for the heavier-gauge replacement cable and full drum inspection rather than a patch job on just the broken strand, since it's a small added cost against everything else in the visit.
On a 2003-era door, the drums and bottom brackets are usually original too, so if one cable snapped from age, the other one is close behind it. We'll tell you straight if it makes sense to do both sides at once rather than have you pay for a second trip in a year.
We travel from Aurora, about 18 miles out, and that trip is part of any visit here - we're not a local branch with a Castle Pines address, so factor the drive into scheduling rather than expecting a same-hour drop-in.