S60 alarm playing up.... again

[signia]

Just after I bought it, I had the mass movement sensor replaced because the alarm kept going off. It was under warranty then, not now.

No problems for years, then it went off last week, last night and this morning all by itself.

So, almost certain that it's the MMS, so I'm wondering where it is, and can I change it myself, then get my dealer to reset the codes next service.

(The old "hold down read and flash fog lights" trick brings up DTCS IN VEHICLE, which I think stands for Diagnostics Trouble Codes).

So - anyone else done this before? I can't find a PN or anything on the web about replacing it.

Cheers.

[valve bounce66]

easy to replace,square box in middle of headlining,just pulls out,new one just clips into that cover.