^that would be the flasher up under the dash u maybe able to replace it yourself. check your driver's side rear one again. actually remove it from the socket and look at it. some of the bulbs have double filaments and u may have one that has a filament burned out and the other one is working. it will still light up but wont be as bright. check for corrosion in the socket and the wiring. the socket may just need to be cleaned out or the wiring fixed. use some dielectric grease then put the bulb back in. use the same bulbs all around, meaning if u use regular ones then stick to them, if u use longer life (LL) use them all around. u mix them u get issues. the LL bulbs burn hotter so they burn out faster.

i have a 92 accord and i had the original bulbs in my car up until last yr. long lasting considering they have over 100,000 miles on them. so this year im replacing them alot. resistance increases with age also. does your hazard light switch work? do the lights work for it? im not sure what bulbs u take. i take on the rears 2057, 1156 and 1157. they look alike yet one is a dual filament the other is single. i have 1 socket that corrodes in the rear. good luck. bulb issues r so annoying.