Boeing notified airlines about the problem in November, tracing it to an O-rin seal and describing it as a slow leak. The leak was estimated to be 8 ounces of water per hour, and Boeing Company stated that the issue was limited to specific 787s. However, the FAA's proposal to inspect and issue other orders would apply to all Boeing 787s. The additional inspections were described by the FAA as a temporary measure while the manufacturer redesigns the tap modules.