Brake Stop Light and EPC Alarm

Hi There,
I have this problem, two weeks ago it is all started with a faulty left turn signal. I replaced it and it worked fine. However, the mechanic was not familiar with German cars so he had to dismantle so many parts at the left side to get to the bulb. Once he put every thing back and turn on the vehicle the EPC alarm and check engine light came on. Later on I found out that the brake stop lights and the cruise control are not working. So my question is:
What part of the brake stop light harness connection that might be affected during our bulb replacement? Before that every thing was fine.

Appreciate your inputs