Quite right about the 5 module on the Arriel fitted to the 365c. The problem was that the chip in the 5 was non-indicating (the N is the same). The failure could occur before enough material had got as far as the chip adjacent to the oil filter.
We had a 365n on approach to a rig, the first indication the pilot had of trouble was when the fire crews turned out on the helideck. Smoke from the dying engine was clearly visible.
After touchdown the engine seized solid. The labyrinth seals for the turbine tore through the casing and were visible in the exhaust.
Then the chip light came on!!!!!!!!!!!!!