Carbon fiber fork scratched. Paint over or replace?
Personally, I'd put some clear (UV stable) epoxy over it and not worry any more about it. 

My MTB has a carbon rear triangle and I had a landing go sideways (literally) when the knobs on the rear tire kicked hard left and started grinding through the clear coat and down through the CF. I stopped the bike as quickly as I could, re-aligned the rear wheel and kept riding. I didn't have time to have it repaired before MTB National Championships last year so I raced it just like that and still finished 9th. I then got some quotes and had it repaired by Calfee earlier this year. It looks and feels even stronger than it did prior to the repair.