IBM 6150 Hardware Maintenance Manual page 214

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
2-16.
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 previously by the diagnostics. but is
now undetected.
- Option
Has the option been removed from the system or moved to another slot?
DID YOU GET THE SAME SRN?
YES Repeat the above steps.
NO Continue on the next page.
OIAG-l
(9/86) Problem Isolation Charts 3-2100-7