Failure-Mode Rank

Purpose

Deterministically rank the candidate failure modes for the fault, matching symptoms and alarm codes to the failure-mode library and applying the repeat-failure root-cause promotion rule.

When to use

• After history-retrieve, in every triage run.
• "What's the likely cause?" / "rank the failure modes" / "is the reset masking something?".

Inputs

• The contract payload with symptoms[], alarm_codes[], and history{} (contract mfg.maintenance-triage.v1).