I believe is the same case being shown here: https://www.ebay.com/itm/Alien-3-EXPORT-RARE-PCB-Jamma-SEGA-System-32-834-9877-02-SN-552910-TESTED-/333796106230
I think that @defor told me that the red dot means that it went back to Namco for an update, so probably the dongle was updated at some point and the version that is actually inside is newer than what the label says....but I prefer if he or someone with better knowledge confirms.
Glad to hear that you like it and are having a nice experience.
Changing music is still not possible for the users as it's a complex process, but we'll try to ease the process and release some tools.