History Retrieve

Purpose

Enrich the fault payload with grounded history: the asset's prior work orders (with their recorded failure modes and dates), similar failures on like assets, PM compliance, and the OEM manual / troubleshooting-guide sections that describe the candidate failure modes.

When to use

• After fault-intake, in every triage run.
• "Has failed like this before?" / "pull the work-order history" / "find the manual section".

Inputs

• fault-intake.json (contract inputs from fault-intake).
• Work-order history export (CSV): date, asset, failure_mode, action, downtime.
• OEM manual excerpt (PDF) and troubleshooting guide (Markdown).
• Optional: historian sample (CSV) — vibration/temperature trend. History input is optional; the plugin runs from documents alone.