What was found
F/A REPORTS CRACKING/CREEKING NOISE COMING FROM THE FLOOR BOARDS BETWEEN ROWS 16 & 17. C/W EA 1-A53-31403, NO DEFECTS NOTED. REPETITIVE INSPECTION REQUIRED. PERFORM GENERAL VISUAL EXAMINATION OF THE PANEL TO ENSURE PANEL IS FREE OF DEFECTS (CRACKS; DENTS; PUNCTURES) IF NOTED; CONTACT SERVICE ENGINEERING. INSPECTION THRESHOLD 100 FLIGHT CYCLES. REPEAT INSPECTION 100 FLIGHT CYCLES. PERFORM PERMANENT REPAIR BY REPLACING PANEL OR RECTIFY, PER AMM 53-21-00/401. PERMANENT REPAIR LIMIT 250 FLIGHT CYCLES REPETITIVE ACTION REQUIRED.