What was found
INTERCOSTALS AT STGR 21L FROM FS 310 TO FS 349 ARE CORRODED. REMOVED AND REPLACED INTERCOSTAL AT STR 21L FROM FS 310 - FS 333 AND REPAIRED INTERCOSTAL AT STR 21L FROM FS 333-349 IAW CRJ 700 SRM 51-21-06-001-001-A01, 51-42-06-001-001-A01 AND 51-40-11-001-001-A01.APPLIED PAINT AND CIC AT RIVETS AT INTERCOSTAL AT 21L FROM FS 310 TO FS 344 IAW CRJ 700 SRM 51-25-16-001-001-A01 AND 51-21-00-001-001-A01. REMOVED FOD. CORRECTIVE ACTION STEP 1 RF SHOULD READ CRJ 700 ESPM 20-26-31 AND 20-21-000-910-801-A01. WVAC EMP STAMP # 776 MTC