Years ago I tried a drill and tap type detent repair kit, thing snapped off after a short period. But maybe they're making them better now?
If you decide to replace you can carefully do one at a time and leave the door in place plus be close to correct door alignment from the start. For a rebuild I wouldn't leave the door dangling that long a period. Which ever way you go, have a buddy help you, even if they can just balance the door. The last thing you need is the door flapping around on one hinge as the jack or dolly slides away and your fingers get crushed.