The universal modular electric/battery double trigger handpiece, serial number (b)(4) was returned for complaint investigation.Visual and functional tests were performed.Upon receipt, it was confirmed that the wire connecting the controller board to the trigger board and the connector of the trigger board were defective.Besides, the motor was noisy.The event reported by the customer was confirmed.As repair, wire connecting the controller board to the trigger board, motor and trigger board were replaced with controller board.Then, the product was returned to the customer.
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