As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXTREMELY LOUD NOISE IN THE LAV IN CUISE AND DECENT COMING FROM THE EMERGANCY EXIT. SOUNDS LIKE THE NOISE FROM THE ENGINE FAN BLADE ALMOST LIKE THE SOUND PROOFING IS MISSING. NO VIBRATION OR ENGINE IRREGLARITIES NOTED. AIRCRAFT PRESSURIZED. UNABLE TO DUPLICATE DISCREPANCY. DOOR SEAL INSPECTED. NO DEFECTS NOTED. OPS CHECKS GOOD. IAW MM 52-20-00