My git repo is broken, how to fix it ?

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Hello,

I use manualy compiled git under cygwin. Some time ago I have imported project 
from CVS and start to us it under git. To emulate 'separate remotes' schema 
for branches from CVS I clone imported git repo and work with it. From time 
to time I incrementaly update imported repo from cvs and sometimes use 
git-cvsexportcommit (from work repo) to export my changes and then get them 
using git-cvsimport.

Some times ago I descide to run fsck and found that by working repo is broken, 
while imported repo is correct. Is there way to fix it ? 

>git version
git version 1.5.0.GIT
(It was actualy compiled from e86d552 commit)
> git fsck
> git fsck --full
error: packed 7f5fed8131fb32972c602dede29b9257a053ba67 
from .git/objects/pack/pack-c4554978bbe079c9a43d6a13546a2fa314fe0884.pack is 
corrupt
sha1 mismatch 7f5fed8131fb32972c602dede29b9257a053ba67

(This is a blob, git cat-file blob 7f5fed813 shows me my c++ header file that 
is partialy broken with ^@ symbols)

The repo I get using git-cvsimport is correct and does not contains that blob. 
I also tried git-log -p for all by branches to force git to show me what is 
the commit was broken but git-log finished without errors.

By the way, several times I interrupt git's commands like commit and pull 
using Ctrl-C.

I tried to unpack all objects:
> git-unpack-objects -r 
< .git/objects/pack/pack-c4554978bbe079c9a43d6a13546a2fa314fe0884.pack; echo 
$?
Unpacking 12868 objects
 100% (12868/12868) done
0

No erorts here. But fsck find that broken blob:
> git fsck 
dangling blob beb992198d4d8813ea51fd1cbbf38313ef490c22

git-cat-file shows me this this is a broken object with correct sha1 sum.


As a cunclusion: my repo has broken file and I don't see there is the brakage. 
Can I reconstruct file by sha1 sum :-) or can I do something to stop fsck 
warn me ?

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