IBM H Series Installation And Service Manual page 106

Step 2010-12
Is the middle LED on any of the disk drives on a backplane off?
NO Go to step "Step 2010-13."
YES Replace the the following FRUs:
1. Backplane
2. EPOW cable
Go to MAP 410: Repair Checkout in Diagnostic Information for Multiple
Bus Systems to verify the repair.
Step 2010-13
Is the middle LED in the drive at the end of the backplane flashing?
NO Go to step "Step 2010-10" on page 2-71.
YES Go to step "Step 2010-14" on page 2-73.
2-72
RS/6000 Enterprise Server Model H Series Installation and Service Guide