Over the course of 2013 I have reset, reprogrammed and audited quite a few Lagard locks. There are a few versions, the 66e being most common when used for audit purposes. For this operation you require specialist software and hardware. I purchased a separate laptop for this very purpose. I can reset a lock with a lost manager code back to factory settings and reprogram the lock. Set up various functions, add users and audit data recovered from the lock.
I have recently obtained software for the Kaba 252 / 552 electronic lock. This will allow programming and auditing functions as well.
Audits can be done discreetly or as part of a general safe service. A manager code is not required as a factory reset does not delete the audit trail. All other users however and all other settings will be lost so if an audit is required a manager code makes everything much easier.