Hi Nick,
The noise at the top of the dash is often the heater vents and I know Nissan had to put a few right. Try pressing down on them when the rattle starts and see if they are the issue and not the light. If it is 100% the light its probably that one of the clips are damaged.
I have one as below but if I was you I would try bonding it down but not with anything too strong.
As for the problem with the stereo I fix the Bose units and have a large stock of replacement parts. PM sent