Have run into this problem all the time. Most owners assume that what they spec. is what was received and that what the engineers have designed would be acceptabe. This hardly the case. You require a third party to come in and oversee your installation. The third party will ony deal with the facts and present thier case as is. This has/will cause plenty of finger pointing, but if all of the steps are followed for proper shipment, handling, installation, runup and proper documentation. The vendor will usally sign off for warranty. Most manufactures/vendors have minimum codes that have to be met. They can be found in the manual that is sent with the piece in question. Don't let the engineers or the warehouse people keep it as it does no good in the filing cabinet