Dead NVRAM (again, properly this time)

hello, 

Sorry my first posting was a bit vague (late night)

A friend has a sparcstation 10 which has lost its hostID due to a dead NVRAM
battery, an old FAQ I read say it is possible to find out the hostID from the
bar code on the chip, does anyone know how to do this.

The bar code is on a yellow label with the letters YHWC beneath the bars,

The machine is a SparcStation 10; model 144; service code S10
and serial numbers 600-3141-02 and 421F0973

Any help would be greatly appreciated

TIA, 

Jamie White.