So I picked up a used 1997 Q45 for $700. It has 189k on it and the body is in awesome shape, a bit of hail damage, but I can't complain lol. There's a few minor quirks, but the main issue I'm looking at is the TCS, ABS, and brake lights on. I did run a scan on the codes and got a few codes: p0110 p0325 p0330 p1110 p1135 p1210 p1400. I read something about replacing the brake relay, I just don't want to replace the relay and find out it could be something else. Any ideas?