As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C CHECK, MAINTENANCE WAS REQUIRED TO INSTALL AN ELT ANTENNA (STC# ST02929AT) PER EMTEQ DRAWING 2-32669-701. MAINTENANCE HAS INSTALLED THE ELT ANTENNA DOUBLER IN THE STA 1503 IN LIEU 1506. ENGINEERING WAS CONTACTED FOR FURTHER EVALUATION. INSTALLATION ACCOMPLISHED PER ABX-REA-2560-64899-01. VENDOR DID NOT REPORT REPAIR TO ABX AIR. THIS WAS DICOVERED BY AN FAA AUDIT OF THE VENDOR.