So here are the details:
Colors in EA:
Coloring values in EA have simple RGB values without transparency. Each red, blue and green value can take an intensity from 0 to 255. The RGB itself is calculated by
RGB = (blue * 256 + green) * 256 + red
The default coloring is equal to -1.
I should put that piece of information also in my Inside book.
Look into t_diagram.geometry. The different labels can be found the in semi-colon separated list under the according tag. LMB e.g stands for Label Middle Bottom and it might look like
LMB=CX=27:CY=16:OX=8:OY=0:HDN=0:BLD=0:ITA=0:UND=0:CLR=65408:ALN=1:DIR=0:ROT=0;
Here the CLR is the RGB value of the label. A complete list of those acronyms can be found on p. 14 of my Inside book.
The line color itself is stored in t_connector.LineColor. It will be overridden if t_diagamlinks.Style has a Color tag in the CSV.
q.