Keyboard becoming unresponsive

Hi everyone
I have got a serious hardware problem, here's the whole story.

About a month ago my D key and neighboring keys stopped working. I removed all the keys found nothing but some strands of white cat hair under them, removed that and checked each key. I got back to the D key and the cushion that was poorly glued onto the inside came off.
I pressed the inner part which released all the other keys.
So after that all my keys except the D key continued to work as they should. I ordered a new D key but it took some weeks to get here. I was doing fine until all the neighboring D keys stopped working a couple of days ago.
I tried gently pressing the D pad, but it didn't work.
Inspected the keys again which look fine. Now soon after that my E and a little after that my 3 key stopped responding.
Yesterday i opened up my MBP and inspected the keyboard cable which was still inserted correctly.
Here is a photo of how the inside of the D key looks. And as a reference i also opened my H key.


* I did try to get the cushion back on right after with folding some plain/office desk tape so it was double sided. That did not work at all it was way to weak to stick but might have left some residue but this is weeks ago. But perhaps being able to clean it might work?

I'm asking you all for info on this, my macbook is only 2.5 years old. I HAVE NEVER DROPPED IT OR SPILLED SOMETHING ONTO IT. Sorry for yelling but i just want that to be absolutely clear.

Hoping someone can tell me how these insides work, the little metal wires that go in certain directions. I'm still hoping its the D key signal being stuck that is making the others malfunction. I could live with one key never working again but i cant live with a whole row pooping out.

To clarify the following keys don't work right now: E, 3, D,F,G,H,J,K,L

In the end it could mean i need to replace the whole keyboard which is devastating to me, after such a short life and my excellent care and loving of the machine. And of course it will cost a lot of dough

 

Still hope someone has some ideas on what this might be caused by, before i replace the whole thing which would cost me a lot of money..