Dynacord E51 Tape Echo

[Mickey]

Was there ever a repair manual produced for the Dynacord E51 valve tape echo? I find these units more difficult to repair/service than the early Klemt NG51 units as the printed circuit board is hidden under a mass of wires and components making tracing the circuitry so much more difficult.
Any and all information of these units would be appreciated but please note I do have the appropriate schematic.
Thanks in advance.
Mickey