immaengineer.
On the HUMS down load, which in the company I work for, we down load after every flight, which is normally about 4 to 5 hrs duration the gearbox foot vibration analysis can be viewed, although I can't make head nor tail of it, ( awaiting the company course). It is then sent away, electronically, direct from the laptops, to our main base and SAC for proper analysis, along with the TGB shaft info, T/Rotor pivot bearing retainer, info, and also the other vibration reports for all the rest of the aircraft.
During Gearbox changes the airframe mount holes are measured for rotation of the bushings and also a maximum/minimum dimensions between holes.