Keyboard and keyboard back-light problem

Hello

I have MacBook Pro early 2011 using Yosemite 10.10.14 as apple seed

Recently I'm have few problems with my Mac I'll write them down and also what I've done to try and solve

1) the forward slash '/' not working along side shift+/ that makes '?'. Also the plus key or equality key '+' '=' not working. When I press all the above separately I get:

'/' makes volume go down or mute

'+' makes volume up and zooms in my screen if I'm in zoom able screen and goes forward if I'm using safari.

2) keyboard backlight on center strong but sides is dimmed

I've tried:

1) default my shortcuts

2) disable dictation buttons

3) pram reset (nvram)

4) smc reset

5) go into recovery repair permissions and disk

All the listed above did not help fixing any of the problems. I'm thinking to reinstall Yosemite but before doing that I'd like To know if anyone encounter these problems and fixe them.

Thank you