Previously (months ago), the dash lights for ABS/ESP were permanently on and codes showed two faults in the control module. Tried again (recently) with the diagnostics with control module connected electrically but detached from the valve block and the previous codes have gone but 'ESP failure to communicate' showed and didn't return when cleared. Reassembled the whole thing today (the control module had been off the car) and when I did even without the ignition on I could hear and feel activity in the unit and it heated up (where the electronics are situated).
Can I assume at this point that the control module is dead in the water?