What was found
SAL - C21 - MAJOR REPAIR - CRACK ON FUSELAGE SKIN PLATE BETWEEN BS 559 TO BS 578, S4R. REPAIRED FUSELAGE SKIN PLATE BETWEEN BS 559 TO BS 578, S4R IAW B737 SRM 53-00-01. UPON FURTHER REVIEW, ADDITIONAL DAMAGE NOTED ON THIS PART. BODY STATION EXTENDED TO BS 639 AND 12 ADDITIONAL CRACKS NOTED. CHANGED ENDING BODY STATION IN DISCREPANCY & CORRECTIVE ACTION, ALSO IN 'STRUCTURE CAUSING DIFFICULTY' SECTION. CHANGED 'THE NUMBER OF CRACKS' TO 13.