I have a fast question, I changed the gummy things under the keys to make them less stiff. I ordered the part and did my job, quite easy I have to say. Now they feel like new.

Only issue is that now the 5 ± low keys don't work :/ (the one on the left)

I must have touched something, but I have to say I have been quite carefull.

I have an idea of how pratt-read keyboards work, and looking at it seems to be fine, nothing broken and all the contacts are fine.

What do you suggest to check (I know a bit of electronic and how to solder and use a multimeter).

Thanks!

Walter