Just read in another thread, it's the S/N of the radio the dealer needs. They should be able to tell you how to get the S/N to pop up on the display.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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