I have 70k miles on my 05 530i and want to do a major tune up on the ride. the only major maintenance work ive done in the past 20k mile was flush the radiator and brake fluid flush. Im gonna start with changing the spark plugs, what else should i change. I do have a maintenance required error..

 

In addition to spark plugs I would have the transmission fluid changed, the MAF cleaned, the air filter replaced / cleaned, the fuel injectors cleaned / serviced.