Hi, I removed my radio and re-installed it with no problems, just be sure that the antenna and other wires are not in the way when pushing it back in, and remove the 2 keys you used to pull it out before pushing it back in place.
For the radio code you must call a Porsche dealer and give them the VIN # of the car that the original radio came with. That is what i did and got the code in 10 minutes, no charge. I don't think the serial # on the radio will get you the code, that would be a joke for thieves don"t you think
Good Luck