IBM THINKCENTER 8189 - Manual (Page 94)

Diagnostic Error Code FRU/Action
305-250-XXX
Monitor DDC self test failure
1. Run Setup to enable DDC
2. Cable
3. Monitor
4. Video card
5. System board
415-000-XXX
Modem
Test Passed
No action
415-XXX-XXX
Modem error
Remove the Modem and re-test the system
88 Hardware Maintenance Manual