They had a simliar incident in Australia were the Oil filter studs sheared and they lost all Oil from the MRGB.
Would seem to be a weak link much the same as the AS332 old style filter housings which had a plug attached by two wee bolts, when they finally failed it to dumped all it's oil, needless to say Eurocopter redesigned the housing.
Probbaly be wise to redesign this one before it fails again.