James, if I can put a positive spin on it - sounds like you've only had a couple of problems and are not faced multiple different issues and "what's going to break next". As others have said, get the turbo hose sorted out properly by someone independent who deals with either turbo's or Landies.
I don't have a Puma, and my only experience with them is driving one around southern Africa for a couple of months in May/June this year. It did actually die on us in the Central Kalahari and end up with a 300km tow to Maun - but that's a different story 
From what I've picked though, if you've got one that hasn't suffered from major mechanical issues early on then its probably a good one and worth sticking with.
Have a serious think about what you're likely to achieve by taking on LR over it. IMO if you're already struggling to cope with with the impending conflict, then you need to be pretty confident that the outcome is going to be worth it. If not, you might be better to put the energy/time/$$$ into fixing it yourself and walk away from the conflict.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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