2001 Clk230 Alarm Fault?

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Gents
Have been getting various problems with the alarm system recently.
When locking the car the indicators continue to flash.
The indicators start flashing at various times after the car has been locked.
The klaxon sometimes alarms at the above times but not always.
Have disabled the interior motion sensor as manual instructs but this does not stop the fault.
The above faults have all been in the recent hot spell.
I have seen some mention on the forum about the interior sensor and a hot car interior sometimes giving spurious alarms.
Any ideas would be really appreciated, also location of alarm "box" and cost of replacement parts if known.
Many thanks
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[DAVECLK]

230k Alarm Fault

Car been to the "stealership" today.
When I dropped the car off I was told that from the symptoms I was giving them it was a 90% chance it was the alarm siren unit fitted behind the panel in the front wheelarch.
Picked the car up today, fault rectified and it was the alarm siren.
Apparently a very common fault!
The total bill with VAT £142.77. can't complain at that!

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