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Try this Board Cleaning & re-Positioning Procedure
Works 98% of the time for this e748-4000
your model is in same family as those listed in pub
Board Cleaning_Board Position-TP07 094.pdf
or----------------------
Check or swap or replace the DDI-S Serial Cable before replacing any boards.
If the cable is poorly connected or otherwise defective an error code of
E748-4000 may be the result.
The cable is pictured below.---------------
Cable DDI-S Serial FK2-0732-000
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