As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER SKIN OF FUSELAGE ABOVE VENTRAL FUEL TANK HAS POSSIBLE CORROSION- REMOVED CORROSION FROM BELLY EXTERIOR AT FUSELAGE DRAIN BETWEEN FR53-54, STR 21L & 21R & REMOVED THE DRAIN MOUNTING PLATE. AWAITING ULTASOUND SKIN THICKNESS MEASUREMENT. DAMAGE TO BE ALLOWED A1 IS PER ETD2019-145-164595 PERFORMED UNTRASOUND AND REMAINING THICKNESS IS 0.123". REPAIRED LOWER SKIN FUSEALAGE ABOVE VENTRAL TANK.