As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) HORIZONTAL STABILIZER SPAR CAP CRACKED IN AREA OF THE LOWER REAR MOUNT BOLT HOLES. CRACK LENGTHS 12.7MM (0.5 INCH). INVESTIGATION FOUND NEW PN 1232624-1 REINFORCEMENTS (SE 84-17) HAD BEEN FITTED IN AMERICA (29JUL84), BUT HAD BEEN INSTALLED UPSIDE DOWN LEAVING THE LOWER SPAR CAP UNSUPPORTED AROUND THE BOLT HOLES. PERSONNEL/MAINTENANCE ERROR.