Test the original trigger and record whether the symptom returns.
Set the reference
Photograph the whole location and a close detail. Include a fixed reference and record what lies above, below, behind or outside.
Capture the trigger
Note weather, water use, occupancy and equipment state. A useful guide connects the observation to the condition that produced it.
Use the right check
Apply the linked non-destructive check and compare with a nearby normal reference.
Choose the next branch
Follow the most plausible cause dossier, but preserve alternatives until a distinguishing clue appears.
Close the loop
After correction, repeat the same observation under similar conditions and store the result in the house log.
Observe→Compare triggers→Repair source→Verify outcome
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