Thanks Dave (you’re on the ball early!)
That’s exactly what was worrying me. I’m outside the 14 day return window and anyway, they would say I had accepted it, which I had.
I think, as you say, I’ll do several safe flights, of different types, i.e. just hover, out "n back, up high etc. and see what happens. But you know what happens with sod’s law, it’ll be when it’s at the limit, over water when it happens again.
I might try and find the previous customer and ask, with no blame attached, what happened to it.