IBM 6151 Maintenance And Service Manual page 262

Step 12
Look at the SRN.
THERE IS A HARDWARE PROBLEM IN YOUR MACHINE. DlAG-2
The Service Request Number is:
WRITE... .down the above number.
RETURN .... to the Hardware Maintenance and Service Manual.
DID YOU GET AN SRN THAT CONTAINS SRA NUMBERS
THAT HAVE NOT BEEN ANALYZED?
YES Record the SRN; then go to "Step 3" on page 3-0010-4 and
analyze the SRA numbers you have not analyzed.
NO Go to "Step 21" on page 3-0060-22.
3-0060-12 Service Manual