ermmm....I clean my own body lah...

;p :bsmilie:
okok, serious now lah...
Usually a general service includes general cleaning of the "body"

outside, clean mirror, clean viewfinder, clean screen, checking of the focusing, clean sub-mirror, exposure checking and calibration if it's not with-in the tolerance...
overhaul is more siong lah, it includes stripping the main circuit board, and prism to clean.....shutter oiling and recalibration....