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1. Previous Communications: Include when there have been prior attempts to resolve the issue, summarizing previous correspondence

2. Expert Opinion: Include when you have obtained independent mechanical assessment or expert evaluation

3. Cost Documentation: Include when there have been expenses related to the issue that you're seeking to recover

4. Safety Concerns: Include when the issue poses potential safety risks

5. Warranty Details: Include specific details about active warranties when relevant to the complaint

6. Alternative Resolution Proposal: Include when you want to suggest multiple acceptable solutions

1. Purchase Documentation: Copy of purchase agreement, invoice, or lease contract

2. Service Records: Copies of all relevant service and repair records

3. Photographic Evidence: Photos or videos documenting the issue

4. Previous Correspondence: Copies of previous emails, letters, or communication records

5. Expert Reports: Any independent assessments or expert evaluations

6. Warranty Documents: Copies of warranty certificates or guarantees

7. Expense Records: Receipts for any costs incurred due to the issue