Write a troubleshooting guide

Help me write a troubleshooting guide.
Inputs: product; known issues; audience.

1. Organize by observable symptoms.
2. provide low-risk checks with expected outcomes.
3. define stop, escalation and sanitized-evidence conditions.

Deliver: Guide, Gaps and follow-ups.
Clarify critical gaps, separate facts from assumptions, and do not invent data, citations or completed actions.

My material: [fill in here]

Before you start

Provide product; known issues; audience.