Hi, Kevin. Finishes can be repaired and this is much better, in many instances, than stripping and refinishing. The problem is that a whole book can be written on this subject and it helps to have at least some experience.
The book "Understanding Wood Finishing" by Bob Flexner devotes a chapter to this subject and this just scratches the surface, no pun intended.
Another problem is that it takes some special products and equipment to do this correctly and this is not easy to find. It helps a lot if you have a Woodcraft store or similar reasonably close to you. The typical home center does not stock these items. And to give you one example, a burn-in knife starter kit costs close to $100 alone but this is indespensible for filling deap gouges.
Therefore, you might be better off to hire a pro to do this. Check you phone book and get a quote. It will probably seem expensive but at least you can make a reasonable decision as to whether it is worth it or not.