Turn signal problem

I just recently bought a 98 mustang and it seems that 2 of my driver side turn signal bulbs in the rear dont work at all. The center one does. The running lights and brake lights all work. I am an engine guy and know engines not too good with electronics so any advice would help. All other lights and bulbs work.

Those are dual-filiment bulbs (dim for parking and bright for turn). The bright filiment is probably burned out in both bulbs.

checked the bulb on the inside, it was good, havent checked the other one yet

problem solved