What was found
CORROSION UNDER PANEL 621AB IN FORWARD INBOARD AND FORWARD OUTBOARD CORNERS AROUND FASTENER HOLES. WS49 AND WS28. REMOVED CORROSION AT R/H WS28 AND WS49 ON AREA OF WING UNDER PANEL 621AB IN FORWARD INBOARD AND FORWARD OUTBOARD CORNERS AROUND FASTENER HOLES AND CREATED GRID FOR NDT TO DETERMINE MATERIAL THICKNESS IAW CRJ 900 SRM 51-21-06-001-001-A01. REMOVED AND REPLACED 6 (EA) DAMAGED/BLENDED OVER FASTENERS IAW REO 690-57-41-474. FOUND TO BE OUT OF LIMITS IAW CRJ900 SRM TASK 57-41-01-101-001-A01. REPAIRED IAW MHIRJ REO 690-57-41-474.