Belgarath, in similar situations we have figured that since there is no trust that needs to be "qualified" and no language and history such as under 401(a) that says that a qualified plan is a (and is only) a plan that meets all the requirements of 401(a), the only reasonable response to this situation under 125 is to adopt a new, current document to replace the old (which, frankly, sometimes cannot even be found), and move on. I have never had the IRS ask for old documents in an exam (honestly, I have never had a client examined for 125, or if this was included in the document request by the agent, it was just checked off for existing), but in the context of corporate acquisitions where we have represented target company usually sophisticate buyer's counsel will accept the replacement document, albeit that they get indemnification, either specifically or generally. So I think the standard of practice is to replace with new and move on.