In an action between an attorney and a client or a former client of the attorney, no work product privilege under this chapter exists if the work product is relevant to an issue of breach by the attorney of a duty to the client arising out of the attorney-client relationship.
Source:
Section 2018.080, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=2018.080..