Change it, did one today at work, easy 30 minute job. All you need is two torx bits, T20 and T50,a thin flat blade screewdriver and of course a new comms 2000 unit (£130 quid no less).
disconnect then battery and have a 5 minute tea break to allow the capacitor to dicharge (this prevents the airbag accidentally operating should you touch the terminals when disconnecting the thing) remove the shrouds,remove airbag squib from wheel, remove steering wheel,disconnect, remove old unit. then replace in reverse order, recheck as you go and lastly replace battery. To be safe stand outside the car while you turn on ignition incase you have made any mistake (health and safety advice) if all ok make sure car in neutral and start engine,still from outside the vehicle. If all OK you are up and running and ready to go. AND you have saved yourself a £30 garage bill and the inconvenience of no car for the day. IF you think you are more of an academic person than practical please leave it to us professionals, chances are you can not follow simple instructions and are incompetant with simpletools, not everyone mind but enough of you to frighten me, Ha Ha.