Comerica sought to vacate an adverse arbitration award on the ground that the arbitrator’s disclosure of prior matters with plaintiff’s counsel said a prior matter settled before a final award without disclosing that the settlement came after an interim award. This decision holds that even if the disclosure would otherwise have permitted vacatur of the award, Comerica forfeited its challenge to the award on that ground by failing to object on that ground within 15 days after becoming aware of the omission or misrepresentation and within the time specified in section 1281.91(c) (i.e., before any arbitration ruling) as required by Ethics Standard 10(a)(4).