(b)(4).The manufacturer investigated and determined that, although the main power was cut off prior to the manipulations of the power supply, as described in the service manual, the capacitor remained charged.While investigating the power supply in the ceiling, it is likely that the field service technician did not use any personal protection equipment, which led to the reported event.Note: the power supply board is located in a closed enclosure in the ceiling, and can only be accessed by trained service technicians.
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