Kilo,
You don't ground a helicopter fleet indefinitely because:
a) a bit of undercarriage broke.
b) or a "taxying accident".
As an ex Seaking man I can tell you there is nothing mysterious about what probably happened, we've seen it all in one form or other over the years from collapsed oleos to brakes that weren't released or were applied too early, exploding tyres to sponsons detaching themselves from the aircraft. It's all in the big book of "different ways to break a Seaking".
They can't afford to ground their Seakings anyway as the Cyclone is still not fit for use and they've already reconfigured at least one of their ships to carry Seaking again.
Cheers now