Doc Cosel 02

Hello everyone. I have a 2006 CLK 350. I have a message saying the rear right brake light is out and the front right parking lamp is out. The bulbs are fine. I have seen threads for this prior to me posting this but the solution people offered was a complex diagram that I have no idea how to read or it turned out someone's bulb was simply out. Is this something I can fix myself? I don't know where to test after I check the power to the bulbs housing unit. Any help would be much appreciated. Thanks for your help.

Plutoe

have you checked for any corrosion---take the bulbs out and look

Doc Cosel 02

Yes. Checked for corrosion and all of that. No rust either. Cleaned it up, still didn't work. It was out, then came back on for about a month, then went out again. I'm not sure if that's a positive or negative sign of what might be wrong...