What was found
BULKHEAD VERTICAL POST AT LBL 18 OTBD SIDE IS CRACKED IN RADIUS ON BOTTOM EDGE OF POST. REMOVED AIR FILTER FOR ACCESS IAW AMM 21-24-01-000-801. INSTALLED AIR FILTER IAW AMM 21-24-01-400-801. REMOVED AIR FILTER HSG BY REMOVING BOLTS, 8 EA FROM SUPPORT STRUCTURE TO ACCESS REPAIR. REINSTALLED AIR FILTER HSG BY INSTALLING BOLTS, 8 EA IAW SRM 51-41-04. REMOVED FS 409+128, LBL INBD & OTBD VERTICAL POSTS IAW SRM 51-42-06. INSTALLED NEW SERVICEABLE INBD & OTBD VERTICAL POSTS AT FS 409+128, LBL 18 IAW SRM 51-42-06 AND REO 601R-53-41-889. ECTC REQUIRED. C/W ECTC REO 601R-53-41-889 AND MET ALL THE REQUIREMENTS OF REO 601R-53-41-889, REV A. RII FOUND TO BE SATISFACTORY.