For each intermittent failure the system shall support an activation and deactivation time parameter to allow finetuning after delivery without reapprovalSystem integrated self test routines shall be supportedEach Subsystem shall deliver additionally diagnostics for lose of functionData for prognostic (Condition based maintenance) shall be delivered (need to be mutually agreed between the supplier and BT).A system internal diagnostics data base based on non-volatile memory shall be provided whereas no internal battery is allowed to supply the memoryThe FIFO Ring buffer principle is to be appliedThe system internal diagnostics data base shall provide capacity to store fault and diagnostic data for an operating period between two maintenance intervals, for at least 100 days.