IBM 3270 Maintenance Manual page 143

The 64/256KB Memory Expansion Option that
matches the switch settings for your error code is
failing.
When the sixth and seventh characters of the
error code are 00, 01, 02, 04, 08, 10, 20, 40, or 80,
the failure is one of the 64K memory modules.
TESTING - XXXKB MEMORY
THIS TEST TAKES UP TO TWO MINUTES
PLEASE STAN D BY
XX:XX:XX
ERROR - XXXKB MEMORY 201 S
FAILING ADDRESS - SPACE/MODULE XXXXX XX
PRESS ENTER TO CONTINUE
7-
ARE THE SIXTH AND SEVENTH
CHARACTERS OF THE ERROR CODE 00, 01,
02, 04, 08, 10, 20, 40, OR 80?
YES Go to page 3-200-21
NO
3-200-18 Maintenance Information