What was found
FS310.00 THRU FS333.00 RIGT SIE FUSELAGE STGR20R CORRODED UNERFLOOR BELOW SREVICE DOOR. (C-CHECK RO 10/9/2021) AFTER FURTHER INVESTIGATION STR20R STRINGER NOT CORRODED, CORROSION IS ON INTERCOSTAL ON STR20R FROM FS310-333. REMOVED AND REPLACED CORRODED INTERCOSTAL/SILL AT STR20R FROM FS310-333 IAW CRJ700 SRM 51-42-06 AND BOMBARDIER DWG SH670-32004. NO FURTHER ACTION REQUIRED AT THIS TIME. SEE CP 22931418 AND CP 22931429 FOR ALL GND TERMINAL INSTALLATIONS.