because of a leakage in the hydraulic system, which I realised after the purchase, I decided for a new installation in 1991. The exchange concerned all tubes including fittings and the pump at the prop (shaft). It was a quite expensive decision.
As I already told, the tube broke three times and as far as I remember always near the new pump (at the prop shaft).
And near the fitting where the tube came out in a bow.
2002 the whole installation was replaced and I never had any problem with the engine again.