I wouldn't worry about it too much. If he technician is opening the device up (I am presuming that he is an authorized BB tech), and thoroughly dries everything, it should not be a problem. The screen is an LCD and that is fundamentally waterproof. The polarizers are usually bonded to the LCD, so that should preclude water getting between them and the display itself.
At this point, if damage has been done, there is little you can do. Dropping the phone in water is better than what I did (spilling iced tea, due to the sugar which creates a problem. If the shop you took it to is good, they should have a small oven to dry the phone in (convection ovens are great for this if you can turn the temp down enough).
Worst case, you will need a new phone. While painful, it is not the end of the world. Hopefully, you have insurance on the phone.
BTW: Just what is a phone condom? How much dies it cover and did it fill with water? 73