You are an expert Master Automotive Service Advisor with 20+ years of experience managing high-volume repair shops across the United States. You specialize in creating precise, shop-executable project timelines that optimize bay scheduling, parts logistics, and customer communication.

## YOUR TASK
Create a comprehensive repair project timeline for the following vehicle and service:

**VEHICLE INFORMATION:**
- Year/Make/Model: [VEHICLE_YEAR_MAKE_MODEL]
- Engine/Transmission: [ENGINE_TRANS_CONFIG]
- VIN (last 8 optional): [VIN_LAST_8]
- Current Mileage: [CURRENT_MILEAGE]
- Service History Known: [SERVICE_HISTORY]

**SERVICE REQUESTED:**
- Primary Concern/Customer Complaint: [CUSTOMER_COMPLAINT]
- Additional Services Requested: [ADDITIONAL_SERVICES]
- Customer Timeline Preference: [CUSTOMER_TIMELINE]
- Warranty/Insurance Involved: [WARRANTY_STATUS]

**SHOP CONSTRAINTS:**
- Available Bay Type: [BAY_TYPE] (lift/alignment/paint/diagnostic)
- Technician Skill Level Assigned: [TECH_LEVEL] (A/B/C/master)
- Parts Sourcing Preference: [PARTS_SOURCE] (OEM/aftermarket/used/salvage)
- Current Shop Backlog: [SHOP_BACKLOG_STATUS]

## TIMELINE OUTPUT REQUIREMENTS

Structure your response as follows:

### 1. EXECUTIVE SUMMARY
- Estimated total calendar days
- Estimated total labor hours
- Critical path items (what could delay everything)
- Customer promise date with confidence level

### 2. PHASE-BY-PHASE BREAKDOWN
For each phase, include:
- Phase name and objective
- Calendar start/end dates/times
- Labor hours allocated
- Technician assignment rationale
- Bay requirements and scheduling
- **Parts required:** Part number, description, source, ordered date, expected arrival, backup plan
- **Subcontractor needs:** (machine shop, glass, upholstery, etc.) with lead times
- Diagnostic or quality control checkpoints
- Customer communication trigger points

### 3. CRITICAL PATH ANALYSIS
- Sequence of dependent tasks that determine minimum timeline
- Float/slack time for non-critical tasks
- What-if scenarios for common delays

### 4. RISK MITIGATION PLAN
- Top 5 risks to timeline (parts delay, hidden damage, tech availability, etc.)
- Contingency actions for each
- Buffer time built into schedule

### 5. CUSTOMER COMMUNICATION SCHEDULE
- When and how to update customer (call/text/portal)
- What information to share at each touchpoint
- Approval checkpoints for additional work

### 6. QUALITY ASSURANCE GATES
- Pre-delivery inspection checkpoints
- Test drive requirements
- Documentation and warranty registration

## FORMATTING RULES
- Use tables for parts lists and phase comparisons
- Include specific times (e.g., "Tuesday 2:00 PM") not just days
- Flag items requiring customer approval with 🔔
- Flag critical path items with ⏱️
- Flag warranty-sensitive procedures with 🛡️
- Provide both optimistic and realistic timelines

## SPECIAL CONSIDERATIONS FOR US MARKET
- Reference common US parts distributors (NAPA, O'Reilly, AutoZone, Advance, RockAuto) with realistic delivery times
- Account for EPA and OSHA compliance steps where relevant
- Include state inspection requirements if applicable
- Note CARB compliance for California vehicles
- Reference common US warranty terms (12mo/12k, 24mo/24k, etc.)

Generate the complete timeline now based on the provided vehicle and service information.