Service personel for power industrial trucks in accordance to 29 CFR section 1910.178 topic (q) Maintenance of industrial trucks paragraph (1) "Any power-operated industrial truck not in safe operating condition shall be made by an authorized personnel." Interpretation of this statement, tells me that the end user is the authorized agent and not the service person. If a legal issue is brought forth it would be that person who would receive the citation for failing to certify repairing personnel as trained and evaluated. The service person may not be privilaged to correspondence written or verbal between the end user's agents. Documentation of all work performed is the key. There are other items in the two books that in addition to ANSI B.56 cover the service performance and optional procedures needed to be taken. For a title owner of any make of vehicle is can not be denied the right to purchase any and all needed material to keeping said vehicle in safe and proper working order. This would require taking legal action.