'05 387 LF Marker Light Issue

Alright, this might seem like a dumb question, but I'm having an issue with the marker lights on my drivers side headlight assembly. The turn indicators are working, but I'm not getting any marker/parking lights at all on the driver side. Passenger side is working fine. I tried checking the fuse box but I'm not seeing anything out of the ordinary. I changed the inner most amber bulb two days ago and noticed the marker lights were flickering briefly. I tried checking the wiring and the bulbs after that and they seemed fine. Advice? Should I be re-checking the fuse box and/or wiring to the lamps?

*Mods: I have copied this thread from the Peterbilt forum where it has received no responses. You may close that thread as I figure I will be more likely to get a response here. Thank you.