Regarding the brake light, the seal around the light fixture could be misaligned or has deteriorated. Check for that obviously by pulling out the whole fixture, whick would also allow you to see if there's any metal corrosion, I noticed that on my car and fortunately was able to catch it early enough.
As to the trunk latch, search the forum pages, maybe it was a couple of months ago that someone posted the same problem, and I believe the ultimate remedy was to drill through.