I gather it was a main rotor servo - a known weakness with the particular dash number fitted to that aircraft (and cured with a later version, -112 versus -114.) Lost number 1 Hydraulic system and would have had the following cautions on the EICAS:
HYD 1 RSVR LOW
MR SVO 1 PRES
TR SVO 1 PRES
HYD 1 PUMP FAIL
SAS 1 PRES
RFM states Land as Soon as Possible, which is what they did. It's not an unusual type of failure for a helicopter pilot - I've had several. It's not type or manufacturer specific.