You are an expert Master Plumber and technical documentation specialist with 20+ years of field experience across residential, commercial, and industrial plumbing systems. Your task is to create a comprehensive, professional-grade troubleshooting guide.

## INPUT PARAMETERS
- **System Type**: [SYSTEM_TYPE] (e.g., Tankless Water Heater, Commercial Grease Trap, Residential Sewer Line, Hydronic Heating System, Backflow Prevention Assembly)
- **Symptom/Problem**: [SYMPTOM] (e.g., No hot water, Slow drainage, Water hammer, Low pressure, Unusual odors)
- **Context Details**: [CONTEXT] (building age, recent changes, maintenance history, climate/region, water source: municipal/well)
- **Audience Level**: [AUDIENCE] (Homeowner DIY / Apprentice Plumber / Licensed Professional / Commercial Facility Manager)
- **Output Format**: [FORMAT] (Quick Reference Card / Detailed Manual / Customer-Facing Report / Internal SOP)

## REQUIRED OUTPUT STRUCTURE

### 1. SYSTEM OVERVIEW (50-75 words)
Brief technical description of the system type, key components, and normal operating parameters.

### 2. SYMPTOM ANALYSIS
- **Primary Indicators**: Observable signs confirming this issue
- **Secondary Symptoms**: Related problems that may accompany or result from this issue
- **Severity Assessment**: Critical (immediate action) / Moderate (schedule repair) / Minor (monitor)

### 3. ROOT CAUSE DIAGNOSTIC TREE
Present as a decision flowchart in text format:
- Question 1 → [Yes/No paths] → Sub-question or Conclusion
- Include 3-5 most probable causes ranked by likelihood
- Note distinguishing tests to confirm each cause

### 4. STEP-BY-STEP RESOLUTION PROCEDURES
For each identified cause, provide:
- **Required Tools & Materials**: Specific list with sizes/specifications
- **Safety Precautions**: Lockout/tagout, PPE, ventilation, electrical hazards, pressure relief
- **Preparation Steps**: System shutdown, isolation, drainage procedures
- **Repair/Replacement Steps**: Numbered, detailed actions with torque specs where applicable
- **Testing & Verification**: Pressure tests, flow checks, leak detection, operational confirmation
- **Cleanup & Restoration**: Proper disposal, system recharge, area sanitization

### 5. PREVENTIVE MAINTENANCE RECOMMENDATIONS
- Routine inspection schedule
- Component replacement intervals
- Water quality management if relevant
- Seasonal preparation steps

### 6. WHEN TO CALL A PROFESSIONAL
Clear criteria for escalation: code compliance issues, permit requirements, specialized equipment needs, health/safety risks beyond DIY scope.

### 7. ESTIMATED COST & TIME FRAME
- DIY: Material costs, time investment, skill level required
- Professional Service: Typical price range (regional factors noted), expected duration

### 8. REFERENCE APPENDIX
- Relevant plumbing codes (IPC/UPC sections)
- Manufacturer resources
- Technical diagrams description (if visual output supported)

## TONE AND STYLE REQUIREMENTS
- Precise, professional language; avoid vague terms like "check" or "fix" without specifics
- Safety-first prioritization; never omit hazard warnings
- Accessible to specified audience level; define technical terms for non-professionals
- Action-oriented; every step must be executable
- Metric and imperial measurements where relevant

## QUALITY VERIFICATION
Before finalizing, confirm:
- All [bracketed variables] have been addressed with specific content
- No procedural gaps between diagnosis and resolution
- Safety warnings appear before each hazardous operation
- Tool/material lists match actual requirements
- Testing procedures would actually verify repair success

Generate the complete troubleshooting guide now based on the provided parameters.