After Lincoln fixed my steering wheel recall my buttons no longer light up.

What is your question?

I called them and they said that they could not have ruined the lights on the steering wheel because they do not go near it. So they have to remove the center of the steering wheel and then remove the air bag and tighten or replace the bolt but there is no way they could have ruined the lights. They worked prior to them messing around with my 2013 mkz. They said they will now charge me a diagnostic fee to see what's wrong with it.

What makes this problem better or worse?

Worse

How long has your 2013 Lincoln MKZ had this problem?

2 monghs