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I expect you've sorted it by now, but anyway this is how you do it in a 348 and I assume a 355 will be the same as the headlamps are identical.
1) Disconnet the battery - the motor can trigger and break your fingers!.
2) Remove the top half of the boot liner.
3) If left hand light, take the four bolts out of the secondary fuse box and move out of the way.
4) If right hand light, remove the washer bottle and move out of the way.
5) Screw the light up to the top using the emergency knob.
6) You will see four bolts on the back of the panel / bulkhead behind the light (hence removal of the fuse box/washer bottle). Disconnect these and the whole lot should come up and out.
7) You can then strip down the motor unit on the bench.