IDGs must be treated with respect.
A few years ago we had IDG temp advisories in the ECAM, or where they apparently spurious intermittent cautions? Anyway, after those everything was normal. We wrote it in the Tech Log. It occurred again in the flight next day and I asked the engineers. They said the IDG was OK and that they had refilled with oil. They checked again and everything was OK. Again they refilled.
In the first occurrence I asked the captain if we should disconnet the IDG. In the second occurrence I strongly suggested the captain to do it. He decided not to. He did not want to lose a GEN.
Later on I asked the engineers if oil consumption was normal and they said it wasn't. "So IDG is not OK" I replied. But they did all checks and it was OK.
A few days later the whole engine was lost during cruise because of the IDG. The crew was unable to disconnect it with the pushbutton and it did a mess in the gear box.
So if your IDGs are drinking oil like kosacks drink vodka... beware!
Sounds like you had a gearbox issue, hard to diagnose, not much tech support on this from the mfgr's often. They don't expect it to ever happen!?! The LAME's most likely did their job's by the book!