That's funny, I have heard that said before though. It wont be needed to be undone
, we have had a system called CONTRAN installed on our 757's for years, I don't know if you have seen it but it is a black box which basically stops any problems in case you get a stuck PTT switch. Well this system was so bad that we just ended up removing the box on every aircraft because it was causing VHF transmission snags. Well we have now started taking this CONTRAN system out and wiring the aircraft to use the in-built stuck microphone system in the VHF transceivers. So this proves there is no such thing as a 'one time job'. There is always something that needs changing, which is good because otherwise I might be out of a job. hahaha.