Only some keys on the keyboard works

I had a bad keyboard with broken keys and replaced it. After that the trackpad stopped working, but the keyboard worked fully. After I got the trackpad working the keyboard started to act up. Now only some keys work. I have done all the resets and stuff and it doesnt do anything. I can wiggle the flex cable and get couple of additional keys to work but they stop working as soon I screw the bottom back on. Im starting to run out of ideas and im not looking for a new keyboard change because its just too much work. I want to hear your ideas what would you try to do in this situation.