I am currently engage with a LEED EB O&M project located in the UK. As part of the WEp 1 requirement we are asked to upload authentictaion document with reference to the date and scope of plulmbing fixtures upgrade for all fixtures and fittings installed or replaced after January 1994. The owner of this building has no documnentation for the upgrade of the plumbing fixtures. Would it be acceptable if the commissioning authority or the Maintenacne company which oversees the maintenance of the builiding provides a letter based on the visual inspection of the plumging fixture types and models. Please advise.