There was a surge in HVAC complaints in the building today. How can I first distinguish between equipment issues and thermal comfort issues?

Today, three floors of an office building reported being too hot simultaneously, and the tenants sounded quite urgent. My engineering colleagues' first reaction was that the rooftop unit was broken. I pulled up the BMS trends, zone temperatures, damper positions, and work order locations first, and found that the complaints were mainly concentrated near the south-facing glass wall; the supply…