my gamecube fan isnt working! help

hi. i got a gamecube just recently. i got it used and it is in good condition it said. when i got it i played my games for about an hour and it just died. i tried to play it again and it died in about 5 minutes. i went online to look up troubleshooting for it and it said check this and that, clean this and that. so i cleaned everything really good and checked everything but it still died. so i checked to see if it was cooling properly and it turns out there is a crack where the fan is and the fan wont run. how can i fix this i.e. should i buy something and do a home reapair or should i go to gamestop and let them do it? please reply