Mrgb after loss of lube
Riff,
I completely agree with your technical explanation.
A run dry condition is an Emergency for the gearbox, and after this,
the transmission is not intended to be serviceable again. As a
matter of fact, dry run test (cfr. AC29.927) requires only that the transmission can still ROTATE freely at the end of the 30 min test, to verify you have no seizures, and that rotor can stiil be driven (ie, the pilot can still perform a controlled landing or ditch the HC)
as far as the transmision is concerned, it is likely to find gear heavy scoring, heavy oveheating of bearings and even casings,leading to several parts
deplacement or even mgb scrap.