What is the test for reversing unanimous verdicts in a civil case?

However, "we do not reverse unanimous verdicts because there is some possibility the juror was improperly influenced. Rather, the likelihood of bias under the inherent prejudice test 'must be substantial.' [Citation.]" (People v. Danks (2004) 32 Cal.4th 269, 305.)

"Whether prejudice arose from juror misconduct . . . is a mixed question of law and fact subject to an appellate court's independent determination." (People v. Nesler (1997) 16 Cal.4th 561, 582.) However, "[w]e accept the trial court's credibility determinations and findings on questions of historical fact if supported by substantial evidence." (Ibid.)

3. Analysis