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An answer is a thermodynamic detection of the second transition, or a bound on its specific-heat jump below the value predicted by models fitted to the ultrasound data.","problem_ref":null,"references":"","settled_by":"Calorimetry or elastocaloric measurements under stress with sensitivity below the predicted second-jump size, on the same samples used for muSR.","status_note":"muSR under stress (2021) reported split onsets of superconductivity and time-reversal breaking, while heat capacity under stress found no second transition above a few percent of the main anomaly.","title":"Is the Sr2RuO4 order parameter 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