As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN R2 DOOR LOWER SILL AREA PANEL SUPPORT HAS CORROSION AT BS960 AS MARK. GROUNDED - YES. REMOVED DAMAGE PER B737-900ER SRM 51-10-02, ORIGINAL THICKNESS .080, MAT REMOVED .030 MAT REMAINING .050 FOUND OUT OF LIMITS PER B737-900ER SRM 53-70-51-1A-1, REMOVED INTEROSTAL I.A.W B737-900ER SRM 51-40-02, LOCATED & DRILLED NEW INTERCOSTAL PER BAC DWG 147A5660 REV B AND I.A.W B737-900ER SRM 51-40-05, INSTALLED NEW INTERCOSTAL PER BAC DWG 147A5650 REV B AND I.A.W B737-900ER SRM 51-40-02.