That number is a location on the mother board.  You should be able to 
look at the board, find the indicated number, and determine if it's a
soldered chip or an easily-replaced module.  I think there's a good chance
it's a memory module, which is good news for you.
-Brian

On Feb 8,  8:54pm, Matt Fredette wrote:
} Subject: SS2 hardware woes
} 
} Hi.  Recently my SS2 quit on me.  At power-up, on the serial console I get:
} 
} *** U0209 ***
}         PMAP = 000d5000, Exp = 00000000, Obs = 04000000
} 
} Google doesn't have anything on this.  Does anyone recognize this
} error?  My guess is either main memory or MMU memory, hopefully
} it's main memory...
} 
} Matt
} 
} -- 
} Matt Fredette
>-- End of excerpt from Matt Fredette