If you are the original owner I would call MK and let them know your delima. Tracy Hoeft (sp?) use to own the company but I now understand he is one of the top executives. You might ask for him...he is a nice guy.
My first mandolin was an MK Legacy and it had none of the issues you are mentioning but I hand picked it from several at Merlefest...bought it from Tracy.
It's worth a call to them to see if they will do anything for you.
2004 Weber Yellowstone Custom Mandolin
1976 Alvarez "The Alvarez" F Style Mandolin
1998 Guild D-40AB Westerly
1997 Martin D-35
1982 Takamine EF-400SC 12 String
1976 Takamine F-360SD Sunburst
1977 Fender F-65