IBM THINKPAD S05L-1270-01 - Manual (Page 560)

FRU Codes: If an error is detected by the diagnostic
tests, a four-digit FRU code is displayed. The FRU code
indicates two suspected FRUs. Replace the FRU that is
indicated by the
two leftmost digits first; then replace the
FRU that indicated by the two rightmost digits. No FRU
is assigned to code 00. If only one FRU is suspected, the
other FRU code is filled with zeros. See the reference
page before replacing the FRU.
Icon Device
ID Suspected Device
103 IR
153 Audio (Crystal)
217 DVD drive in UltraBay II
218 External DVD drive
154 USB port
155 USB port of the port
replicator
156 First external USB port
157 Second external USB port
FRU Code FRU
10 System board
11 CPU card
12 DC/DC card
16 Modem card
548 IBM Mobile Systems HMM