As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS UNDERGOING AN ANNUAL INSPECTION. DURING THE FUNCTIONAL CHECK OF THE ALTERNATE AIR SYSTEM THE TECH DISCOVERED LOOSE AND WORN ALTERNATE AIR COMPONENTS AT AIR BOX ASSY. NEW PARTS WERE INSTALLED AND SYSTEM RIGGED IAW MM. SYSTEM FUNCTIONED NORMAL. MANUFACTURER WAS NOTIFIED AND SUPPLIED PHOTOS.