Circuit board for controlling one of the air curtains at the main entrance, repaired.

Think the young lad was impressed that I'd identified the likely fault as he passed it to me, and before it had left his hand. Easy one. Another blown capacitor. About 15 pence to repair, if you include some solder. He was mightily relieved that it worked, though perhaps not as much as the poor receptionist attempting to shelter from the icy breeze.