As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INSTALLATION OF FINLETS DEVIATED FROM DWG CAUSING CORROSION WHICH LED TO THE HORIZONTAL STABILIZER AFT SPAR REPLACEMENT. DWG 6R1-2017, 8000 SERIES FLOATS, THE AFT ATTACHMENT FOR THE FINLET CALLS FOR A NUTPLATE NAS696 BUT A MS21044N3 NUT WAS INSTALLED IN ITS PLACE. TWO OTHER ACFT IN FLEET HAVE SAME PROBLEM SO FAR & THE ENGINEER WHO REPLACED THE SPAR SAYS THE WHOLE FLEET IS THE SAME.