What was found
AIRCRAFT 3251, UPPER FUSELAGE PAX CABIN BETWEEN FR15 AND FR16 R/H SIDE AT STOP FITTING #1, INTERCOSTAL WITH SCRATCHES AND TOOL MARK. CORRECTIVE ACTION: ACCOMPLISHED INTERCOSTAL REPLACEMENT AT FR16 RH DOOR STOP #1 IAW ER/A #589110-14AD REV A. (LP 1615986 - AIRCRAFT WAS GROUNDED)