Purpose: Fix systems that users complain about—feedback, uneven sound, instability, or poor intelligibility.

Typical Scope
• Fault isolation and root-cause analysis
• Measurement-guided troubleshooting
• DSP correction and protection fixes
• Wiring/polarity/gain-structure correction (non-physical)
• Operational misuse identification
• Stabilization settings for real-world use
• Clear remediation summary (what was wrong, what was fixed, what remains)

Charges can be either day-rate or problem-base pricing. Price state is just estimation.