Assambler knowledge required

I want to change the writing and error lights, what I mean-
now when it writes it blinks in red, but you know the red light looks like there is a problem with the device.So I want when the drive is in writing mode to blinks in orange and when recover from
a Buffer Underrun error or SmartBurn to blinks in red
Could you tell me where I have to edit the firmaware’s hex *.bin file/2s0d/ to do that

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http://club.cdfreaks.com/showthread.php?threadid=68921