IBM RT PC Problem Determination Manual page 79

S t e p 82. B l i n k i n g T w o - D i g i t Di s p l a y
1. Get a Problem Summary Form from Appendix B of this manual.
2. Write the Service Request Number 16-986 on item 4 of the form.
3. Have the system unit serviced.
Appendix B. Problem Summary Form
2-51
Section 2. Hardware Problems