Hello,
just a bit more infos.
Take care about the jumpers on the A3000T, because they are more complex of the A3000D; you can learn about it on some documents like 'The Zorro III bus specification' and 'The A3000 local bus expansion slot specification' both found here...
http://www.thule.no/haynie/
A wrong jumper configuration on your A3000T can lead a damage of the motherboard.
About what wrong on a not working A3000 motherboard, the answer can be: Agnus (few probability) or the socket (more probability), FatGary (very few probability) or his socket (same as Agnus's socket, and same as all the PLCC sockets on the board); one of the CIA (can be, especially on the A1200 and A4000) or, in your scenario, all the area between FPU and ROM. The question is: how react a not working FPU? Can be disabled on motherboard like a working one? I do not know!
If this motherboard was mine i detach the FPU, the two sockets of the ROM, i repair what is needed to attention, put a socket for the fpu (or solder it directly on motherboard, it depend on the skill of the technician) and then hope that all is fine! About the damaged track, i replace it with fine copper drawn like the original traces, to avoid this fat wires.
I have spoken about A3000T, without CPU and FPU, sold with an A3640: that is true but i do not know the jumper configuration! Take care about it!
I have repaired some A3000T that came from Poland and i know what i say about FPU and ROM socket!
The chek of the linearity of the pins on the PLCC socket, with IC inside, is good and i suggest you to look at this thing.
Regards
Stefano