You are going to have to replace the entire board to do that, the leds are attached to a ROC board.....unless @wilsonbr90 can help ya out with replacement
Check with wilsonbr90. He can switch out the LEDs for you, if it is an issue with the LED. I've had him change the colors on one of my Legends a couple of years ago. Looked good as new, If it's a board issue, I don't believe he can help.