1. Add a Channel Mixer layer, check the "Monochrome" box, and enter +100, 0, 0, 0.
2. Add a D&B layer, and clip it to the Channel Mixer layer. Don't touch it yet.
3. Add a Levels layer and clip it to the other two. Enter these values:
R 0/1.00/250 and 0/255
G 0/1.00/255 and 0/220
B 0/1.00/255 and 0/205
4. Return to the CM layer and mask it to the problem areas.
5. Return to the D&B layer and gently burn the remaining problem areas.