What was found
MAIN AVIONICS BAY STR 21L BACK-UP SILL CORRODED BETWEEN FS333.00 AND FS349.00 (C-CHECK RO 7/8/2022) MAIN AVIONICS BAY STR 21L BACK-UP SILL CORRODED BETWEEN FS333.00 AND FS349.-00, INTERCOSTAL OUT LIMITS. REMOVED AND INSTALLED NEW STR 21L BACK-UP SILL FROM FS333.00 TO FS349.00 IAW CRJ700 SRM 51-42-06-001-001-A01, CRJ700 SRM 51-42-21-001-001-A01 AND DWG: SH670-31810 REV AE / . COMPLIED WITH TASK CARD 51-900-1002-SKY.