What was found
TWO NUTS ON THE AFT LH WING HINGE BOX WS 178.00 AND TWO NUTS ON THE AFT LH WING HINGE BOX WS 220.00 ARE CORRODED (C-CHECK) RO 1/29/2021 REPLACED TWO NUTS ON THE AFT LH WING HINGE BOX WS 178.00 AND TWO NUTS ON THE AFT LH WING HINGE BOX WS 220.00 WITH NEW ONES, PN: MS17825-9 AND PN: MS17825-7 IAW CRJ 200 AMM 57-21-35-400-801/802 STEPS 3. A. (4)-(6) AND (10)-(12). / CALIBRATED TOOLS: TUC4198 CAL DUE:31-MAR-2021, TUC4978 30-JUN-21