We have inspected your 3DS unit. There are problems with the button and switch electronics in the system. This delicate repair requires the disassembly of the console in addition to component level repairs to the electronics on the motherboard to replace the shoulder button which are integrated into the motherboard of the system. In addition our technician noted that the other buttons require cleaning and dust was found on the motherboard and screen. The dust need to be thoroughly cleaned out or you run the risk of shorting a component on the board. The total cost for replacing the shoulder button parts, repair, cleaning the unit, with in store pickup is $59.95. That includes a 90 day warranty on the replacement parts and repair. As an alternative we can simply return back your unit to you and the inspection and diagnostics fee is $26.95.