Ian pointed out another wiring error preventing the DF side working correctly. I missed out a wire from the centre tap of L24 to the V1 V2 tag board. The lower diagram on p136 should be as shown below.
Below the last diagram on p137, before the two lines of text, add:
While in this area you can add R62 & R63 if you like. These are 2.2k static leak resistors from pins 1 and 2 of plug 1 earthed to the triplet on C93. I did not bother.