What was found
LEVEL 2 CORROSION / MAJOR REPAIR: AFT RT SERVICE DOOR THRESHOLD PLATE UPPER SURFACE HAS LEVEL 2 CORROSION BETWEEN FRAMES 36 & 39. REMOVED THRESHOLD PLATE, INTERCOSTALS, ETC. REMOVED CORROSION FROM THRESHOLD WEB, FOUND OUT OF LIMITS (LENGTH 4 INCH, WIDTH 3 INCH AND DEPTH .020 INCH). RE-INSTALLED INTERCOSTAL & AND INSTALLED NEWLY FABRICATED THRESHOLD IAW SRM.