Hairline Cracks in Macbook 5.2

i got macbook repaired, free did not repair right area. assumed meant inner casing, wrist rests. replaced keyboard, lcd lid, , wrist rest area.

have hairline cracks in bottom casing, magnets shut lid. heard unibody casing free replacement, 2009 macbooks covered on outer casing?

http://www.appleinsider.com/articles/09/04/08/apple_addressing_cracks_on_white_macbooks_casings.html

http://macs.about.com/b/2009/04/08/apple-to-repair-cracked-white-macbooks.htm

if so, how go it?
has had these cracks, , worse?
l

 

call , ask.

 

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