Okie dokie, SH2 hard puzzle mode question before I lose my mind...
I'm in Brookhaven Hospital, third floor, at the locked door that leads to the patient wing. The solution to the keypad is given in the Whiteboard Message, but I do believe after much looking we're actually missing the solution here at the wiki (for hard mode). Now I'm quite positive that the letters are probably to be interpreted as their numbers in the alphabet, albeit I cannot for the life of me figure it out. Any ideas?