(2) Pledging such securities for more than the amount due, or otherwise disposing of such securities for the dealer's own benefit, when the dealer has a lien or indebtedness on such securities.
It is an affirmative defense to a charge under this division that, at the time the securities involved were pledged, sold, or disposed of, the dealer had in the dealer's possession or control, and available for delivery, securities of the same kinds and in amounts sufficient to satisfy all customers entitled to the securities, upon demand and tender of any amount due on the securities.