Here is the required 6,000 mile service schedule for R 1200 GS Adventure. This is directly off of the dealer service check list of the what is performed. I only know this because I was looking at purchasing a GS when shopping for my adventure bike. All these checks are easy but time consuming when done properly. So for 250.00 you are getting a great deal.
Reading fault memory with BMW Motorrad diagnostic system
Oil change, engine, with filter
Checking valve clearance (for maintenance)
Visual inspection of hydraulic clutch system
Visually inspecting brake pipes, brake hoses and connections
Checking front brake pads and brake discs for wear
Checking brake-fluid level, front brakes
Checking rear brake pads and brake disc for wear
Checking brake-fluid level, rear brakes
Checking freedom of movement of Bowden cables and checking for kinks and chafing
Checking tire tread depth and tire pressure
Checking ease of movement of side stand
Checking ease of movement of center stand
Checking spoke tension, adjusting if necessary
Checking lights and signaling equipment
Function test, engine start suppression
Correcting engine synchronization (for maintenance)
Final inspection and check of roadworthiness
Reading fault memory with BMW Motorrad diagnostic system
Setting service-due date and service countdown distance
Checking battery charge state
Confirming BMW Service in on-board documentation