trying to track down DRL/front turn signal issue. help please?

Hi all, hopefully this is posted in the right place, wasn't exactly sure if the lighting sub forum was aftermarket modification only or not... but this is a OEM 2005 Tacoma equipment question. I recently had my front left turn signal go out, (wouldn't light, flashing 2x as fast rear). I got a new bulb, swapped it in, and... not fixed. I put on the hazards, and they (the other 3) flash at the correct/normal rate, and passenger side turn signals function normally. Because of this i was thinking that the relay and fuse are OK, and it's the bulb socket possibly being fried? or is there something else to look at before i buy a new socket and replace it? (and if a new bulb socket is in my near future, any leads on a decent place to buy one?

thanks in advance for any help.