I changed the marker light on my drivers side taillight. Simple fix. But then a day later I ran my IID Tool to check faults and here's what came up (see attached).

Now my low beams aren't working. High beams are fine. Bulbs are fine. Fuses are fine. I pulled the taillight again to check wiring and everything seems fine. What gives? Any thoughts are appreciated.

As well, if you notice anything with any of these faults, please comment.
Thanks.

 

Changed the marker lights with what?
Are you certain everything is clean and attached properly?
Did you touch the grounds?