[Premium-Rx] Manual for Teletron [Pfitzner] TE712B needed

[John Graham 02]

I recently acquired two "demilitarisiert" Teletron TE712B receivers cheaply [EUR120 each] from a German dealer. They had very battered front panels but were otherwise complete.
There were enough undamaged parts to rebuild one front panel (after hammering it flat!) with original parts and I was able to get the first receiver working without too much difficulty. Fortunately, the displays, which include an HP calculator-style strip of 14 lensed LEDS, were undamaged because they are mounted on solid wire "stalks" that simply bent. I replaced the broken meter faces with curved plastic sawn from a pill-box.

For the other receiver, I had to replace most of the pots and switches and build my own keypad from single Cherry keys, and that front panel now works, too.
However, I am struggling to get much further because there is a fault with the synthesiser and I do not have any circuit diagrams. [I have built my own extender cards and cables].

Can anyone provide a source for the TE712B Service Manual or at least the schematics? The remote control format would be good, too.
A manual was listed by Algra Funkarchiv, but they do not reply to mails and I'm not sure they are still in business [I think the proprietor has been ill]. 

I seem to recall someone offering a pdf version of the manual on this forum a few years ago.

Any info gratefully received!

John Graham