leaks can occur if the seals on the lights have been disturbed replacements are abt £10 each check the drain holes in the gutter around the boot are not blocked don't poke them with wire as this can puncture the tubes the most common reason for the roof service message is a broken wire that feed hall sensor 3 in the rear wing. if you need to top up the fluid dont over fill as to much is worse then too little . check for fluid leaks if a top up is required . dry up any water as the roof pump is wrapped in foam an will hold moisture. a scan with vida will narrow down any faults with the roof module join the c70 owners group on face book for info and experts on running c70s.
ps yes the nuts are captive and wont fall off