IBM 6151 Maintenance And Service Manual page 319

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Step 6
The diagnostic programs were unable to determine the location of
the failing IBM AT 512 KB Memory Expansion Option.
1. Exchange one of the IBM AT 512 KB Memory Expansion
Options.
2. Run xxK Bytes of IBM AT Memory Checkout.
If
needed see
page 2-17.
Note: If the failing memory expansion option is still installed
in the system unit, you will get the TEST OPTION menu.
Answer the question on the menu to get an SRN.
TEST OPTION
The following option was detected previuusly by the diagnostics, but is
now undetected.
. Option
Has the option been removed from the system. moved to another location,
or turned off'
DID YOU GET THE SAME SRN?
YES
NO
Repeat the above steps.
Continue on the next page.
(6/88) Problem Isolation Charts 3-2100-7