So I managed to fix it up.
Turns out I had four bad traces after the battery damage.
But I could see that Denise was still putting out a signal. And I really felt I'd got the soldering work done after checking connectivity to other parts of the system.
So with that in mind, I thought it could only be Paula that had a problem. As no floppy access would occur and that's Paula's job.
Ordered one from Vesalia and popped it in and she's a workin