IBM 5155 Manual To Operations page 155

Test 7900
You have completed the Problem Determination
Procedures with no failures. Remove the scratch
diskette from your drive. Return the Diagnostic
diskette to the back of this manual. Your system unit is
ready to load your operating system.
If
you should have any other problems, contact your
place of purchase for additional help.
January 1984
Test 7900-1