IBM 5531 Operator's Manual page 73

Problem Determination Procedures
Test 500 - Color/Graphics Monitor Adapter
(continued)
2. Did the following appear on your screen?
5-500-2
Operator's Guide
YES -
Press Y; then press the Enter key. Proceed with Step 3.
NO -
Press N; then press the Enter key. Record the error message, and have the system
unit serviced.