As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER FUSELAGE STA727 CENTER DRAIN DOUBLER HAS CORROSION AROUND FASTNERS GROUNDED - YES. REMOVED AND REPLACED CENTER DRAIN DOUBLER AT LOWER FUSELAGE STA 727 IAW B737-900ER SRM 51-40-02 AND DWG NO. 146A0070 REV A. DWG 146A3239 REV -, BOEING CONTROL # 270917615.