IBM AT/370 Manual To Operations page 75

Hardware reference library
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19
Did the following appear on your screen?
ERROR: Have system unit serviced; ERR CODE=
XXXX
(XXXX is any number.)
Note: More than one error message may
appear.
YES- Record the message(s) and error
code(s).
Have your system unit serviced.
NO -
Proceed with step 20 on page 4-20.
Problem Determination Procedures 4-19

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