As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD NOISE IN THE COCKPIT WHILE CLIMBING THROUGH FL190. DISCOVERED NO AIRFLOW FROM RT SIDE COCKPIT WEMAC VENT. MADE PRECAUTIONARY DIVERSION BACK. FOUND SCAT TUBING & CLAMP DISCONNECTED FROM RT SIDE COCKPIT WEMAC VENT. SECURED HOSE & CLAMP. OPERATIONAL CHECKED SATISFACTORY.