R1200C in for service at Affordable Beemer Services LLC in Manchester, New Hampshire in April 2009: Brake fluid was very dark and the front brake had air in the system resulting in a spongy lever. Engine oil was dark and the incorrect spark plugs (BKR7EKC) were removed and replaced w/ proper Bosch FR6DC plugs. Tire pressures corrected to F = 34 / R = 36 psi. Valve clearances were slightly snug probably due to the 1 feeler guage @ a time method of adjustment during a previous service.