California Code, Financial Code - FIN § 14407

(a) Whenever the losses of any credit union resulting from a depreciation in the value of its securities or otherwise exceed its undivided earnings and reserve fund so that the estimated value of its assets is less than the total amount due its shareholders, the credit union may, if approved by a majority of all members at a meeting called to consider the matter, order a reduction of the liability to each of its shareholders, so as to divide the loss equitably among the shareholders. If thereafter the credit union realizes from its assets a greater amount than was fixed in the order of reduction, the excess shall be divided among the shareholders whose assets were reduced, but to the extent of the reduction only.

(b) The commissioner may approve a reduction in the liability on shares approved by less than a majority of all members as provided in subdivision (a) if the commissioner finds, upon the written and verified application filed by the board of directors, that (1) notice of the meeting called to consider the question was mailed to each member entitled to vote upon the question, (2) the notice disclosed the purpose of the meeting and properly informed the membership that approval of the reduction in liability might be sought pursuant to this subdivision, and (3) that a majority of the votes cast upon the question were in favor of the reduction in liability.