As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-15 CHECK A 3/8 INCH CRACK WAS FOUND IN TCAS EXTERNAL DOUBLER SKIN LOCATED BETWEEN BS 380 AND BS 390, STR 1 RT AND STR 2 RT. MAINTENANCE STOP DRILLED CRACK AND PERFORMED AN HFEC INSPECTION TO VERIFY CRACK WAS CONTAINED. FABRICATED A REPAIR DOUBLER; INSTALLED REPAIR PART IAW ER 03-5331-04328-RC1.