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T10 discolored?? As in burnt insulation?
The TX node is 12vdc during transmit, so a short to ground at TP5 or TP6 would indeed cause some discoloration.
What is the current draw from the battery when transmitting?
I assume you looked at Q92,93.? Those voltages look good?

As I recall, the Kicad decal used for the transformers is that of a 300 mil 6 pin DIP package.
Pin 1 is square, go down to pins 2 and 3, across to pin 4 and up through pins 5 and 6.
Pin 6 is opposite pin 1.

Odd it went from 7 to 100 going from TP4 to TP5, way more gain than we expect..
Perhaps half of that push-pull circuit is shorted out.
Is there a signal at C91 but not at C90?? They should give the same RF probe readings.
How do TP5 and TP6 compare, these should also have equivalent RF probe readings.

Most of those transformers are center tapped, so the actual signal strength is double the voltage you measure against ground.
Of course, for a given signal power level, the voltage you see will depend strongly on the load.
The load presented by the IRF510 in particular varies wildly, especially with frequency, but also with the bias point and power level out.

You can get pretty far with just an ohmmeter and a hard look at the schematic,
For example, the resistance seen between the antenna wire and TP7 should be near zero with rig power off.
With power off, only the 10/12 meter filter is engaged (L11,12,13), so you might look for transmit power on 10m
if you thought you were having trouble back there.? (Vic is not.)
Also, we have in the distant past had reports of poorly machined BNC socket connectors, where the center pin of the?
antenna coax does not make a good connection with the BNC socket.

Good to hear that my remark might have helped.
I try to post something on topic occasionally so the moderators don't kick me off the forum.

Jerry, KE7ER