Civ. Code, § 1782

(a) Thirty days or more prior to the commencement of an action for damages pursuant to this title, the consumer shall do the following:

(1) Notify the person alleged to have employed or committed methods, acts, or practices declared unlawful by Section 1770 of the particular alleged violations of Section 1770.

(2) Demand that the person correct, repair, replace, or otherwise rectify the goods or services alleged to be in violation of Section 1770.

The notice shall be in writing and shall be sent by certified or registered mail, return receipt requested, to the place where the transaction occurred or to the person’s principal place of business within California.

(b) Except as provided in subdivision (c), no action for damages may be maintained under Section 1780 if an appropriate correction, repair, replacement, or other remedy is given, or agreed to be given within a reasonable time, to the consumer within 30 days after receipt of the notice.

(c) No action for damages may be maintained under Section 1781 upon a showing by a person alleged to have employed or committed methods, acts, or practices declared unlawful by Section 1770 that all of the following exist:

(1) All consumers similarly situated have been identified, or a reasonable effort to identify such other consumers has been made.

(2) All consumers so identified have been notified that upon their request the person shall make the appropriate correction, repair, replacement, or other remedy of the goods and services.

(3) The correction, repair, replacement, or other remedy requested by the consumers has been, or, in a reasonable time, shall be, given.

(4) The person has ceased from engaging, or if immediate cessation is impossible or unreasonably expensive under the circumstances, the person will, within a reasonable time, cease to engage, in the methods, act, or practices.

(d) An action for injunctive relief brought under the specific provisions of Section 1770 may be commenced without compliance with subdivision (a). Not less than 30 days after the commencement of an action for injunctive relief, and after compliance with subdivision (a), the consumer may amend his or her complaint without leave of court to include a request for damages. The appropriate provisions of subdivision (b) or (c) shall be applicable if the complaint for injunctive relief is amended to request damages.

(e) Attempts to comply with this section by a person receiving a demand shall be construed to be an offer to compromise and shall be inadmissible as evidence pursuant to Section 1152 of the Evidence Code. Furthermore, these attempts to comply with a demand shall not be considered an admission of engaging in an act or practice declared unlawful by Section 1770. Evidence of compliance or attempts to comply with this section may be introduced by a defendant for the purpose of establishing good faith or to show compliance with this section.