How do I diagnose tricky faults high up on a turbine?

Spotting an obvious fault is real skill. The subtle ones, especially high up where you cannot spread out and think, are a different test. Being stumped there does not mean you are behind. It means you are meeting the harder end of the craft. Subtle faults reward slowing down, which is hard when you are hundreds of feet up and want to be done. Trust your senses. Sound, vibration, heat, the small things that feel slightly off. When you cannot solve it up-tower, gather what you notice and reason it through once you are back on solid ground. Next climb, bring a way to record what you observe rather than trusting memory. Notes, a voice memo, a photo. The subtle fault often reveals itself when you review it calmly later.