IBM X.25 - Manual (Page 40)

FRU and Error Code Table
Use the information in the following table to identify the failing FRU
(field replaceable unit). Part numbers for FRUs are listed in “Service
Parts” on page 4-22.
Note: Without manual intervention, the diagnostics take two or three
minutes to run. If the diagnostic tests run for more than one
minute for any routine, suspect a faulty base card.
Error Code Range Replace
00–85 Base card
87–FF Base card
86 Interface cable
LED (always On, always Off, or
blinking) Base card
Note:
When the system is powered on, the LED should come on for a few seconds
and then go off and remain off.
4-12 X.25 Co-Processor PCI GTO