GN09MGU

An update.... Second time I tried re-inserting the fuse the alarm sounded but was OK once I had started the car. Third time similar, but then everything went wrong - immobilized, windows not working, indicators flashing. Eventually managed to get it started and back to the parking spot. Fuse out again.

I am now about to remove the SCU and sent it to Technozen. I would be grateful for a few tips:
- I should disconnect the battery first, according to the workshop manual. Should I leave it like that or reconnect whilst the SCU is missing?
- is there a preferred sequence on re-inserting the SCU (battery disconnect??? alarm fuse in first or after????)

I need to avoid triggering the alarm (or it triggering itself) - not only whilst I am working on the car, but also whilst the SCU is away. I park for free in a spot outside a near-neighbours house, so need to keep on good terms with them...

Meantime, I noticed the under-bonnet light did not come on. That was fixed simply by replacing the switch mounting screw - presumably not earthing through the old screw.