IBM pSeries 670 Service Manual page 239

Step 152i-44
Are all the green "power good out" LEDs of both I/O subsystem DCAs off?
Yes Go to "Step 152i-45".
No Call for support.
Step 152i-45
Remove the following DASD 4-packs, if present, from the I/O subsystem. Record the DASD locations:
v DASD 4-pack at P3
v DASD 4-pack at P4
v DASD 4-pack at P5
v DASD 4-pack at P6
Step 152i-46
Turn on the power.
Step 152i-47
Did the system stop with the same error code as recorded in "Step 152i-1" on page 214?
Yes Go to "Step 152i-53" on page 220.
No Go to "Step 152i-48".
Step 152i-48
One of the DASDs just removed is defective.
Turn off the power.
Make sure all the green "power good out" LEDs of both I/O subsystem DCAs are off.
Step 152i-49
Reinsert one of the DASD 4-packs that is removed and listed in "Step 152i-45".
Step 152i-50
Turn on the power.
Step 152i-51
Did the system stop with the same error code as recorded in "Step 152i-1" on page 214?
Yes One of the DASD in the DASD 4-pack just reinserted is defective. Replace it. This ends the
procedure.
Return the system to its original configuration.
Go to "MAP 0410: Repair Checkout" in the RS/6000 and Eserver pSeries Diagnostic Information
for Multiple Bus Systems.
No Go to "Step 152i-52" on page 220.
Chapter 3. Maintenance Analysis Procedures
219