As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AAIP PHASE INSPECTION, FOUND UN-DOCUMENTED GPS INSTALLATION. FOUND ANTENNA MOUNTED IN PRESSURE VESSEL AREA WITH NO SEALING OR DOUBLER, COULD CAUSE VESSEL FAILURE. REPAIR OF FUSELAGE AND ALTERATION, INSTALLING ANTENNA, MADE USING APPROVED DATA. ALWAYS DO A GOOD PAPERWORK CHECK WHEN DOING INSPECTION CHECK FOR UN-AIRWORTHY INSTALLATIONS.