The power supply units were found to be damaged due to poor workmanship. It seems that they have done a wrong connection; otherwise this wouldn't happened like this.
No. Damage is due to some external cause, eg you drop a unit. Also, be less wordy.
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No.
Damage is due to some external cause, eg you drop a unit.
Also, be less wordy.
The power supply units were found to be faulty. It seems that they have an incorrect connection.