IBM RT PC 10 Hardware Maintenance And Service page 49

Introduction
3-4 Service Manual
Begin the problem isolation at "Start of Call PIC" on page 3-5, then
carefully follow the steps to isolate the failure to a field-replaceable unit
(FRU).
The IBM RT PC ModellO problem isolation procedures use the IBM RT
PC Diagnostic Diskettes and run tests from the ADVANCED
DIAGNOSTIC SELECTION menu.
Information about the tools required is in Appendix A.