As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT DECK EXCESSIVELY NOISY WITH BOTH RECIRC FANS ON. SERVICE TIP 21-22-00, LEFT PACK CONTROL VALVE AND TCV ALREADY REPLACED. LM4517 ALREADY ACCOMPLISHED. WIND NOISE AND NOISE LEVEL NOTED HIGH. USING SVC TIP21-22-00 901 DECIBEL READINGS 72-75 AND AIRFLOW WITHIN LIMITS TESTING AT S21. AIRFLOW THROUGHOUT CABIN NORMAL.