Re: Fri 13th Style Misery <Boot Release>
I reckon the lock is seized, hence the relay clicking but not releasing and the key snapping. I think your best option is the ski hatch. Can you send a small child in?? also try filling the lock with wd40, if it is seized that is. The old 75 used to have a back up rip cord under the back seat for releasing the boot dont think 155 has one. In fact not all 155s have the ski hatch do they??
Are there any access point in the boot floor you could knock out and get to the catch. I would go for the 12v on the wire if you know it is the correct wire.
same thing happened to my dads 164, key was broke in the lock and the battery went flat so could not release the boot. Where is the battery on a 164 - yes in the boot. Had to find a suitable place to connect the battery charger under the bonnet.