So, ive had a problem with the rear left lights, for about 2 weeks now ive had a error come up on the dashboard for the rear left lights (indicator, brake and fog) doesnt pop up as soon as i start the car but once its been driven for 5-10 mins, the lights do work as they work before the error pops up, ive checked and changed the fuse, but it still keeps popping up, any advice on what it would be and what it may cost.