How to repair broken ACL tree structure?

Cakephp Acl behavior sems not to work correctly. Application after few
weeks of working on production server has some of Acos broken (in fact
all tree structure is corrupted).

Can Acl system be used to repair a damaged tree (basing on the
parent_id fields)?
Or maybe some1 has got algorithm (cakephp wise) to fill corrupted lft
rght values with correct ones?

Cakephp v1.2.0.7125 RC1;

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