What was found
LH AFT HINGE BOX NUTS AT WS 264, FWD HINGE BOX NUT AT WS 220, AND FWD AND AFT HINGE BOX NUTS AT WS 178 ARE CORRODED/RUSTED AND REQUIRE REPLACMENT. (C-CHECK RO 4/1/2021) REMOVED AND REPLACED LH AFT HINGE BOX NUTS AT WS 264, FWD HINGE BOX NUT AT WS 220, AND FWD AND AFT HINGE BOX NUTS AT WS 178 IAW CRJ 200 AMM'S 57-21-35-000/400-801,802,803 REFERENCE CONTINUATION CARD FOR WORK PERFORMED