Can a court reverse a finding of waiver of a contractual right to arbitrate?

While waiver of a contractual right to arbitrate is ordinarily a question of fact, "where the record before the trial court establishes a lack of waiver as a matter of law, the appellate court may reverse a finding of waiver made by the trial court." (Weisman v. Johnson, (1982) 133 Cal.App.3d 289, 293, 183 Cal.Rptr. 792.) The converse is also true--if the trial court finds a lack of waiver or makes no finding even though the record establishes a waiver as a matter of law, the appellate court may reverse the trial court's finding or hold there was a waiver as a matter of law where the issue was raised but no finding was made.