A. The contractor must be allowed an opportunity to review, troubleshoot and repair defects. If a third-party is hired by the owner before this opportunity is given, then the warranty for that particular item is generally voided by the contractor and/or material supplier. The original installing contractor should always be the first one notified of a problem. Keep in mind, the O&M Manuals presented to the owner at the conclusion of the project provide an outline of the many necessary maintenance requirements for the various complex systems incorporated into the building. A lack of proper maintenance on the part of the owner will also void warranties and decrease the life-span of the building, the equipment and the fixtures.