As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECREASED AIRCRAFT PERFORMANCE NOTED FOLLOWING INSTALLATION OF TURBO-NORMALIZING STC NR SA 5223NM. INVESTIGATION FOUND TURBO FLITE SYSTEM WEIGHT DATA TO BE INCORRECT. USING CORRECTED DATA STILL DOES NOT APPEAR CORRECT PER ACTUAL WEIGHT DATA FROM AIRCRAFT.