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Where the event was traced to a component failure (vacuum regulator, vavd valve), the component was replaced and the device successfully tested.Where the event was traced to vavd valve wiring issue, the wiring was rerouted away from the fan, and the device successfully tested.Where the event could not be replicated, and components were not old, extensive testing was done to ensure the device operates correctly.Where components were older, they were upgraded out of precaution.The serial numbers were as follows: (b)(6).
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