A method for reprocessing an endoscope for the implementation of leak testing the endoscope, the method including: connecting the endoscope in an airtight manner to a compressed air hose, which is operatively connected to a compressed air source； subjecting the endoscope to compressed air up to a predetermined pressure level via the compressed air hose； during the pneumatic leak measurement and after opening of an outlet valve, measuring a temporal course of air pressure in the endoscope without any further compressed air supply； measuring a temporal change of the air pressure at the outlet valve； and determining one of a tightness of the endoscope or a leakage of the endoscope based on a temporal gradient of the temporal change of the air pressure.
