I tend to agree with FADEC 225. Even if the TRU 3 is found to be unserviceable it is not a NO GO item ..meaning the flight will still have to proceed unless there are other valid reasons (snowing hard?). I had suggested this earlier on but the FM says it is before flight so the company just follow. In our case we do ther engine wash one at a time so the RRPM is always at 100% .