2005 Boxster.
I've checked the bulb and it's fine (changed it just to be safe) but still nothing. The headlight works. All 3 of the other turn indicators work (front and rear right side and rear left). Hazards show the same issue -- only front left light is out. I checked the contacts on the lamp socket and the connection in the rear of the headlight module with a continuity checker and everything seems A-OK. The blades inside the socket seem to be fine.
Before I take it to a dealer for a more.. expensive.. diagnosis, is there something else I should check?