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I'm not sure how much this may help anyone, but I got a copy of Service Bulletin 04-028 which covers DTC 77 & 78 (Battery Deteriorated). It covers the entire removal and installation process for the battery pack and covers which BCM and MCM's need to be replaced.
http://members.dslextreme.com/users/gobuchul74/sb04028.html
http://members.dslextreme.com/users/gobuchul74/sb04028.html