Hi I have a 2006 Octavia II have had it from new now all of a suddne it no longer beeps when locking and un locking the car? I looked at the manual and it advises the siren only has a life of 7 years..??? My car is 5 years old? Could it be the siren that has packed in? I recently had the boot painted / touched up there could not be any co-incidence there could there? Thanks