i wouldnt worry too much about the 107k miles ,these cars are capable of huge mileage if theyre looked after properley,i would think any issues will have been sorted under warranty with it having lexus history.
The only problems you might have wouldd be DPF if you only drive on short runs and EGR clogging up but to be honest you would have same problem with any turbo diesel of the same age if it doesnt get a motorway run each week.
I have a 2007 with 91k on it and have had no problems ,touch wood.