What was found
LOUD NOISE FROM FRONT OF COCKPIT. INSTALLED RECIRC FAN PER MM. LEFT RECIRC, SOUNDS AND OPS CHECKED NORMAL
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LOUD NOISE FROM FRONT OF COCKPIT. INSTALLED RECIRC FAN PER MM. LEFT RECIRC, SOUNDS AND OPS CHECKED NORMAL