What was found
(CAN) ACFT WAS TAXIING AROUND APRON, AND WHILE MAKING A RT TURN THE LT MAIN GEAR IN INADVERTENTLY COLLAPSED. PERFORMED ENGINE GROUND RUN TO RUN HYDRAULICS, HAS STC SA7GL INSTALLED, PUT SWITCH TO EXTEND GEAR DOWN AND LOCKED, RELEASED ACFT OFF OF FLOATS, CONFIRMED DRAG BRACE OVER CENTER LOCK ENGAGED, TAXIED AROUND APRON TO ENSURE ACFT LANDING GEAR WOULD NOT RETRACT, BROUGHT INTO HANGAR. PERFORMING A FULL LANDING GEAR INSPECTION FOR SERVICEABILITY OF THE AMPHIBIOUS GEAR.