I found a company that advertizes the Diagnostic module for the Merlin II. I know the Merlin II is almost ancient technology but it still works. When I look up the part number [61389A] on Avaya, Lucent, or AT&T, the search comes back with no results. Does anyone know if the module really exists? If it does exist, what exactly does this module do? I want to know more before spending the money.