What was found
CORROSION ON FLOOR SEAT RAILS IN SECTIONS FS 485 TO FS 581, 9 RBL; FS 581 TO 661+32, 9 LBL/9 RBL; FS 661+32 TO FS 693, 9 LBL/9 RBL] AT PAX CABIN. FLOOR SEAT RAILS IN SECTIONS FS 485 TO FS 581, 9 RBL; FS 581 TO 661+32, 9 LBL/9 RBL; FS 661+32 TO FS 693, 9 LBL/9 RBL WERE REPLACED, PER CRJ900 AMM 53-00-49-400-801 (CONFIG A11) PAR 4.