Described is a method for detecting andor for monitoring the level of a medium stored in a vessel and in particular to a method for diagnosing the functionality of the electromechanical oscillation unit of a vibration level gauge. Various combinations of reel lines, utilized to determine possible wins from symbols across multiple reels, of the reel display, may be available to the players. The CDs include one side on which data is recorded, and another side on which the CD label is printed. Cable faults are identified by the evaluation of potential swings in current.