Brian Abraham states, "Actually the C30 gave very good service, only recall one catastrophic engine failure in all the years of operation."
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You, sir, are extraordinarily UNINFORMED, ...
.... or perhaps new to the industry.
Our average time between engine removal the first couple of years on the S76 A was 128 hours. The C30 blew up with alarming regularity - hence the first "containment kit" - 170 pounds (4 big slabs) of unobtainium designed to deflect the blast outwards and upwards. This bit of sillyness was the Sikorsky/Allision response after a friend of mine blew one up taking out the good engine (this happened numerous times) the AC & DC electrics (junction box under the left engine) AND the TR driveshaft. His says it gets really busy when that happens - and it happened a lot more than once!