In our search for our travel trailer we reviewed many a layout. We realized that space and the practical design are sometimes in conflict. So anytime that wood finished surfaces are either near cooking or water including shower stalls and sinks, the surfaces will be prone to damage. Some of these are left unprotected to add aesthetics to help sell trailers. We realized once we bought our TT we would have to protect them by covering them with urethane or another protective film to help preserve the factory finishes.
So as to how to repair damaged areas there are many different products you can use to achieve your desired look. You're really depends on whether the finish over that area has failed already, if it has, you're going to have a difficult time making it look appealable. Other products to consider while dabbing on with a very small artists brush:
Acrylic hobby paints
Small 1/4 pint cans/jars of stain
Artists oil paint tubes
Powder stains used with liquid base coats (pad-lac)
Danish oil products
Even natural products like coffee or berries.
Once you have artistically created the repair you'll need to protect the finish. Something that those quick fix products don't do is provide a lasting protective film. You can rub those pencils on the repair sites but they rub off as quickly as they rub on.
Once mastered you have a new trade to market!