I agree with most of the above. Time for tuneup procedures. and new chain.
Grease what all has loose bearings.
My disc brakes went 10,000 miles, so I doubt you need a pad change but maybe get spare pads since you do high mileage.
Staehpj1 is right about tire changes, especially for the populated states. Otherwise. if the miles are 3,000+ then I would consider putting a new tire on the front and rotate it to the back. As for wear, I have 2 heavy duty tires with over 5,000 miles, SMPs and a Conti TP. I noticed that they do wear a lot faster after the glossy coating is gone. Look for how many little cuts are in the treads.
Spare bolts and cables are a good idea.