This unit was manufactured in 03/2001 and has been in the field for over 12 years.The model was discontinued in august 2007.The converter casting housing of the 765 dc was returned to manufacturer for evaluation on (b)(4) 2014.Evaluation of the returned part was completed and the root cause of this failure was determined to be improper installation.The top lag bolt was over stressed and broke the wall-mounted converter housing.This failure is not caused by a fault in the design or manufacture of the 765 dc.There was no injury from this incident, and this was an isolated incident.This concludes our investigation.
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