Hi - just looking for a quick bit of advice. W210 E240 petrol year 2000, has been pretty much perfect for 10 yrs and 100k miles, (except for the rust that is). Just developed a fault that I think is in the alarm system, when locking with the key fob, the indicators flash 3 times as normal but then continue to flash rapidly. Have checked all door switches and boot switch all seem clean and working OK. Also it now comes to mind that the alarm used to 'chirp' three times with the indicators when setting - and the chirp stopped about 3 months ago. Is this the alarm system ? If so I saw a few posts on here pointing at the siren module - is this a likely suspect? - If so where is it?