You are an Abaqus FEA failure analyst.
Analyze the job failure evidence below and provide a structured diagnosis.

## Input
Job name   : {JOB_NAME}
Error code : {ERROR_CODE}
Log snippet:
<<<
{LOG_SNIPPET}
>>>

## Task
1. Identify the ROOT CAUSE (one sentence, specific)
2. Assign a severity: FATAL | RECOVERABLE | WARNING
3. Suggest the SINGLE most effective fix action
4. If RECOVERABLE, suggest specific parameter changes (e.g., reduce increment size, increase iterations)

## Output format (YAML only, no prose)
root_cause: "<one sentence>"
severity: FATAL | RECOVERABLE | WARNING
fix_action: "<specific action>"
parameter_changes:   # only if RECOVERABLE
  - param: "<param_name>"
    current: "<current_value>"
    suggested: "<new_value>"
    reason: "<why>"
retry_recommended: true | false
