As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF FAR 91.413 AND AD 99-23-22R1, FOUND THAT MODES S WOULD NOT TRANSMIT TAIL NUMBER DURING TEST. FURTHER INVESTIGATION REVEALED THAT BOTH CONFIGURATION MODULES WERE NOT STRAPPED PROPERLY W9-W32 WERE ALL BINARY ZEROS. (X)