California amendment to UCC 9-626(b)

(b) In a consumer transaction, the following rules apply [to a situation
in which the amount of a deficiency or surplus is in issue]: 

(1) In an action in which a deficiency or a surplus is an issue:
(A) A secured party has the burden of proving compliance with the
provisions of this chapter relating to collection, enforcement,
disposition, and acceptance whether or not the debtor or a secondary
obligor places the secured party's compliance in issue.
(B) If a deficiency or surplus is calculated under subdivision (f)
of Section 9615, the secured party has the burden of establishing
that the amount of proceeds of the disposition is not significantly
below the range of prices that a complying disposition to a person
other than the secured party, a person related to the secured party,
or a secondary obligor would have brought.

(2) The debtor or any secondary obligor is liable for any
deficiency only if all of the following conditions are met:
(A) It is not otherwise agreed or otherwise provided in the Retail
Installment Sales Act (Chapter 1 (commencing with Section 1801),
Title 2, Part 4, Division 3, Civil Code), and, in particular, Section
1812.5 of the Civil Code or any other statute.
(B) The debtor and obligor were given notice, in accordance with
Sections 9611, 9612, and 9613, or Section 9614, as applicable, of the
disposition of the collateral.
(C) The collection, enforcement, disposition, and acceptance by
the secured party were conducted in good faith and in a commercially
reasonable manner.

(3) Upon entry of a final judgment that the debtor or obligor is
not liable for a deficiency by reason of paragraph (2) or subdivision
(f) of Section 9615, the secured party may neither obtain a
deficiency judgment nor retain a security interest in any other
collateral of the debtor or obligor that secured the indebtedness for
which the debtor or obligor is no longer liable.

(4) If, subsequent to a disposition that does not satisfy any one
or more of the conditions set forth in paragraph (2), or subsequent
to a disposition that is subject to subdivision (f) of Section 9615,
the secured party disposes pursuant to this section of other
collateral securing the same indebtedness, the debtor or obligor may,
to the extent he or she is no longer liable for a deficiency
judgment by reason of paragraph (2) or subdivision (f) of Section
9615, recover the proceeds realized from the subsequent dispositions,
as well as any damages to which the debtor may be entitled if the
subsequent disposition is itself noncomplying or otherwise wrongful.

(5) Nothing herein shall deprive the debtor of any right to
recover damages from the secured party under subdivision (a) of
Section 9625, or to offset any such damages against any claim by the
secured party for a deficiency, or of any right or remedy to which
the debtor may be entitled under any other law. A debtor or obligor
in a consumer transaction shall not have any damages owed to it
reduced by the amount of any deficiency that would have resulted had
the disposition of the collateral by the secured party been conducted
in conformity with this division.

(6) The secured party shall account to the debtor for any surplus,
except as provided in Section 701.040 of the Code of Civil
Procedure.