TCU, I think

I just got pulled over tonite and the officer gave me three days to fix my problem. The problem is I have no running lights in the rear but my breaklights still work. My dash also does not light up. I know the dash is tied into the tcu but are the rear running lights tied to it as well? They seem to have stopped working around the same time as when the dash lights went. Anybody have an extra tcu I could buy? and anybody know how to replace the tcu? Thanks