Since I am back from a trip and you are ALL wrong I shall tell you the answer. Your mistake is in attempting to pick another letter when your supposed to be looking for a 4 digit code to open the door. If you picture X, Z, or T overlayed on a number pad X can equal 1937. Z can be 1379 and that leaves you the answer of T=1328.
Those 3 letters are the only ones that can define 4 numbers in this way which is why it asks what will they do next month?
Thanks for playing but you lost a life time supply of turtle wax.
