what is your troubleshooting approach field issue

Have ONE repeatable method and say it clearly. Recommended: 1) DEFINE — what's actually failing, what 'fixed' would look like. 2) ISOLATE — change one variable at a time to find the cause (don't change five things at once). 3) TEST/CONFIRM — verify your hypothesis with a measurement before acting. 4) FIX + VERIFY — implement and confirm it holds. 5) DOCUMENT — write it so the next person doesn't re-diagnose. The one-line frame: 'I isolate one variable, let the data pick the cause, and I never declare it fixed until it holds.' This is literally your Onto strength (root-cause diagnosis). Speak it with confidence — it's the most direct proof you can do the GPS job. Tie it to a real field/diagnostic example.