how do you document a field fix so others can reuse

This is the GPS core — turning a fix into something reusable. Your approach: 1) Capture the SYMPTOM and the ROOT CAUSE (not just the steps — the why). 2) Write it so someone with less context can follow it — clear steps, expected results, and the warning signs to check. 3) Note what was tried that DIDN'T work (saves the next person from dead ends). 4) Make it findable and versioned, and get it reviewed. The one-line frame: 'A fix isn't finished until it's documented well enough that the next person doesn't have to re-diagnose.' You've done this — your documented reference-standard calibration at Onto is exactly this. Show you see documentation as part of the fix, not an afterthought.