What was found
COE HEAVY CK / MAJOR REPAIR: INTERNAL FUSELAGE UPPER PRESSURE DECK LT SPLICE ANGLE FR 27 STR 4 IS CRACKED WITH CRACK EXTENDING INTO THE SIDE BOX INTERCOSTAL. UPPER PRESSURE DECK ANGLE CRACKED AT FR 27 APPEARS TO HAVE PROPAGATED BEYOND PREVIOUS REPORTED MARK ON SRAS 4920/05...3364, ALSO FOUND PART BETWEEN FR 27-28 CRACKED. CRACK ON P/N S53573201210 IS 2.6" LONG APPROX 1" ABOVE STR 4L. CRACK ON P/N S53373201204 IS APPROX 1.6" LONG APPROX 1" ABOVE STRINGER 4L. REPAIR PER STRUCTURAL REPAIR INSTRUCTIONS FROM ATR.