What was found
(CAN) DURING ROUTINE INSPECTION, WITH ACFT ON JACKS, FOUND RT UPPER WING SKIN BUCKLING BETWEEN WS 30.0 & WS 49.0, BOTH FWD & AFT SKINS. ALSO FOUND, AFT RT WING UPPER SKIN SLIGHTLY BUCKLED AND LIFTING AT FWD. MAIN SPAR JOINT AT WS49.0 & FUSELAGE BS 137.0 JOINING. NO UPPER SKIN BUCKLING NOTED ON LT WING. FOUND BUCKLING OF MAIN SPAR WEB PLATES, BETWEEN UPPER & LOWER SPAR CAPS, ON LT & RT SPAR WEB AT WS 30.0-49.0. BOTH WING SPARS, NO SEVERE TURBULENCE OR OVER-WEIGHT LANDINGS REPORTED. ACFT REMOVED FROM SERVICE FOR FURTHER INVESTIGATION. NOTE: THIS IS THE SECOND ACFT FOUND WITH THIS CONDITION BY THIS OPERATOR.