AIDE Reports changed:/boot/grub/stage2

[gmane-2006-01-01 at jt-socal.com (John Thomas)]

My daily AIDE report suggests Grub's stage2 file has changed.  Could I 
trouble you for your opinion about how concerned I should be and what to 
do if your concern is moderate or higher?

File: /boot/grub/stage2
   MD5      : Mlkt9ZVo59SSjvodt+956Q==          , 
yIQIMP6TUHG5BegtoOk0ug==
   SHA1     : ZxehaXSXcnH/WlcInHpFnyT1vcg=      , 
dReBGlO3DIAB+mjsxUWioB8NlbE=