I recently noticed my rear tail light (Bottom right portion) is flickering while parked and driving, sometimes when I unlock it the bottom right portion does not turn on at all. Any ideas what it could be? the previous owner cracked a small bit of the plastic and fixed it with superglue. Thinking maybe water got in it ... please help!!!

 

If it's cracked, it's probably wet as you suspect. Doesn't take much to damage them, and the fix is a new light.

 

Just failing. Seems to be very common. I just changed mine and noticed my passenger one is ALSO failing (only the very bottom third strip isnt working). Always seems to be the lower LEDs being the issue. Very easy swap, just match part numbers on a used one or new replacement.