interior code

[JCM_G8GT 0]

picked up a XXXX shaft on a recent trip through NH. It's a 77 flex. In the image you can see three groups of numbers in the yellow interior strip. While one may think it's the flex profile across three zones 77 56 77. Not that it matters as it plays well but curiosity does exist.

Please, no speculation. Only if you really know, please confirm or deny.

FWIW, I know there are other threads with flex code speculation, I did not see any with images of the interior code.