While standing an "at sea watch" onboard a modern rectified DC diesel-electric drive ship you notice the transformer core temperature slowly rising. What should be your FIRST action?

Correct Answer: Option A — check the transformer ventilation fans for proper operation

Transformer overheating under normal electrical load directly points to inadequate cooling. In accordance with IEEE 45 and machinery management protocols, immediately inspecting ventilation blowers, cooling fans, and air filters ensures forced-air heat dissipation systems are fully functional.