IBM 3270 Maintenance Manual page 175

The first, character of your error code is 6, 7, 8 or
9.
1.
Replace the 256KB Memory Expansion Card.
See Section 5, "Removal/Replacement and
Adjustments. "
2. Rerun the diagnostics (see page 3-200-55). then
return to this page and answer the question
below.
DID THE DIAGNOSTICS COMPLETE
SUCCESSFULLY?
YES
Your system· is now functioning correctly.
NO If you get the same failure., replace the
128KB Memory-Printer Adapter. See
Section 5, "Removal/Replacement and
Adjustments." If you get new error, go to
page 3-200-1 and follow the PIC again.
3-200-50 Maintenance Information