I don't know how much gap there is under the slot but a good camera with macro setting should be able to take picture then you could blow up the image on the computer to see where and how far the crack goes.
I goes further than I hoped... or let's rather say that the crack is worse than I hoped.
First step of soldering this morning, before I had to go to work:
(I'm ashamed of posting that pic, as it looks dirty because of my shitty wires which starts to melt at 1inch from the soldering iron :oops:)(and no, there's no short
)
Anyway, things get better:
Tomorrow I'll work on the other cut traces under the slot, and post the results soon after.