IBM 6151 Maintenance And Service Manual page 224

Step 6
1.
Record the SRNs for the errors that are related to the hardware
you servIce.
2. Look up the FRUs that correspond to the SRAs in each SRN.
3. The FRUs are listed in the most likely to fail order.
4. Exchange the FRUs one at a time. Check the fix by asking the
customer to run the failing application program again.
DID THE SAME FAILURE OCCUR?
NO This completes the repair.
YES Continue on the next page.
3-0090-6 Service Manual