Evidence relating to claims of malpractice and professional misconduct, shall be admissible only to the extent that those claims bear upon the fees, costs, or both, to which the attorney is entitled. The arbitrators shall not award affirmative relief, in the form of damages or offset or otherwise, for injuries underlying the claim. Nothing in this section shall be construed to prevent the arbitrators from awarding the client a refund of unearned fees, costs, or both previously paid to the attorney.
However, the award, judgment, or agreement shall not be so enforced if the attorney has demonstrated that he or she (i) is not personally responsible for making or ensuring payment of the refund, or (ii) is unable to pay the refund.
Ca. Bus. and Prof'l. Code § 6203