reidh, OEM has technical support for their engines. Whenever major failure occurs, the fact engine is within the insurance coverage, the insurance firm definitely investigate the Root-cause failure. Eventually, they require the OEM to issue certification of the said catasthropy, else other than OEM requires a Cetified Service Center. Thus, insurance fee is served.
Other case like minor failures, we often refers to the manual. However, some specific OEM of bearings,rods, etc offer their technical support. Why not contact OEM?
Thanks.