MBP 2010 had Mobo replaced - Now keyboard lights not working?!?!

Hi,
I have just picked my MBP 2010 back up from the apple store, after it having its main logic board replaced. After having it back home for a few hours, I have only just noticed that the keyboard back lights are no longer functioning. By turning the brightness up with the f6 key, it brings up the HUD which shows the brightness bar going up, but the lights are still off.
I have tried to go into the settings and turn off the option that says automatically illuminate keyboard in low light to see if that fixed the issue, but no success. I have also installed lab tick, but this still did not get the backlight functioning.
The last thing I tried was a SMC reset. I performed this twice but to no avail.
I have tried to search the forums for alternative reasons as to why they would not be working, but cant find anything.
Can anyone advise me as to what my next step should be? I would like to try to fix this myself rather than take it back to the apple store, as it is about an hours drive away (last resort). I have read that there is a cable that connects the keyboard backlight, and this could become loose during maintenance. Is this easy to find / check ?
Thanks

Just incase people have the same issue down the line, I managed to fix this problem myself within 5 minutes.
I found a guide on ifixit.com for my model of macbook and then looked at the logic board replacement section (as this is what repair it had been to apple for).
I found the section regarding the power ribbon for the keyboard lights, and after taking my mac apart, I realised that they had not connected the ribbon, and it was still left unattached under one of the fans.
Carefully connecting this back and then putting the fan back solved the problem. So a simple 5 minute job has saved me a long trip back to see apple.
Thanks for your help anyway guys!

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