Cambridge DiscMagic Transport

Bit of a long shot here but I am getting an intermittent fall out of signal when using the AES/EBU OUT into the AES/EBU IN of my Behringer Ultramatch. It would seem that there may be a mis-match or signal overload? The LED which relates to the Balanced In flickers when the dropout occurs. I have only just tried the balanced out on the cambridge. The SPDIF works fine.

As the Cambridge is a very old unit I cannot find any information about it online.