IBM 6151 Maintenance And Service Manual page 226

Step 8
1.
Remove the last FRU you exchanged.
2. Install the original FRU.
3. Exchange the FRU that corresponds to the next SRA in the
SRN.
4.
Ask the customer to run the failing application again.
DID
THE SAME FAILURE OCCUR?
YES Go to "Step 7" on page 3-0090-7.
NO This completes the repair.
3-0090-8 Service Manual