As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND THE AIR CYCLE MACHINE INLET DUCT INSTALLED BACKWARDS ON THE BOTTOM OF THE LT WING PANEL WELD ASSEMBLY. REMOVED AND REINSTALLED THE LOUVER IN THE PROPER POSITION. THIS HAD ALSO OCCURRED ON AIRCRAFT S/N UE-145, BOTH FROM THE FACTORY. (X)