As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACK IN THE WELD BETWEEN THE HOT AND COLD AIR PLENUMS ON THE ACM. SUBMITTER STATED THIS DEFECT AREA NEEDS TO BE ADDED TO THE INSPECTION GUIDES OF THE WESTWIND. THIS SAME PROBLEM HAS BEEN FOUND ON AT LEAST 6 OTHER WESTWINDS. ACFT TT: 7960.6 HOURS.