When there are multiple color code letters the 1st letter is the predominant exterior color, then the secondary.
From the link below: A = Raven Black, K = Fiesta Red, and S was used to note "Styletone", stainless trim separating the colors on the Fairlane models.
See the "Color Code" description on PDF page 10 (document pg 18) at this link... https://thecvaonline.com/howtos/DataPlateDecoder.pdf
There are 2 different sets of page numbers, the page numbers of the PDF window and misc numbers that aren't printed on all the document pages.... I'm using the 'PDF window' numbers.