Video doorbell pro not working after power outage

Worked fine until we had a power outage overnight recently. Now it doesn't appear to have any power to it, but I measure 26.9VAC. The doorbell rings if I replace the Ring with a dumb switch. I personally replaced the transformer a couple years ago, but don't recall which model I installed. May have been 24VAC. In any case, wondering if I need to climb through the attic to get to the transformer or if the doorbell pro is fried. Not sure how to diagnose this.