Yes, they went out of business 4 maybe 5 years ago. They had a Web Page selling off the last of their stock on the Internet for ages (long after they had sold most of the items). I have a set of their gear and like it very much. It is possible to buy leads to interconnect other mfgs. gear. The trouble is they had a different system of wiring which is not compatable and so you need these leads. Any competent repair/maintenance company should be able to do repairs for you and make up leads if you need to replace components with mainstream gear, as Digifleet spares are no longer available.
What price they would charge and their decision to bother or not will be reflected in if they are prepared to do one-off jobs with little future in it.
Roger in France.