L322 ABS DSC AIR Suspension Inactive

Hello, I have RR 2005 Vogue TDV6 168k with ABS DSC Air suspension inactive. FAULTS In ABS system the fault 5A Brief power interruption shows - I can clear this however reappears as soon as I turn my ignition off. Faults 32 CAN BUS Fault and 74 Unknown fault are stored in the suspension ECU. SAS has a fault that it could not be error established on startup. I have no idea where to look - I have charged the battery up - the suspension is locked at height it sits nicely and doesn't lose any air over night. I have check all fuses and clears the multiplex plug on the ABS pump. Would a SAS calibration be needed as my diagnostics does't appear to give me this function - I know the lock to lockprocedure on the steering wheel etc. any help would be kindly appreciated