Lu,
Thirty years ago, when I first made acquaintance with the Lynx, the engines pi$$ed oil from the exhaust on shut down. To this day they still do it and the 'excuse' is that RR didn't realise that the engines would be mounted 5 deg nose up. They've had thirty years to put a px operated check valve in the PT brg feed.
To go back to the original question - 'Lynx' and 'reliability' is a contradiction in terms.
Taff