marshall avt50h schematic?

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Hey you guys who have fixed Marshall AVT Amps!

I got the schematic from Enzo - MANY thanks but my problem is locating things on the main PCB.

My 40, 0, -40 main power supply is FLOATING (at 2/3 of the ECC83/12AX7 B+ above chassis).

Thus the conducting path clearly shown on the schematic is open.
The path that joins the centre-taps of the two transformer secondaries.
But I have searched for many hours and cannot find any such connection (track or link) either on the main PCB or via any other board. Nor any sign of a burn.
Is it hidden under that muck they use to glue the smoothing caps down?

Many thanks
 
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thanks
 
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