well, they still maintain that the drivers swivel is fine, despite the "surface muck" as they call it. they've not seen it a second time yet though.
My plan (next weekend now, as I'm busy tomorrow and so are they) is for them to check the swivel level, find it empty, see it leaking and then make their own mind up that it needs replacing.
You see, if they don't think it needs replacing, then they're not gonna do it with a 2 hour labour discount because I asked for it to be done "if required", and they don't see that it's "required" and it'll therefore be treated as a new, separate job.
Basically i'm gonna convince
them that it needs doing, so they decide to do it themselves. that way, it makes the whole situation "happier", they realise
they were in the wrong and therefore happily give a discount, and I don't seem forceful
the most forceful i'll ever be is convincing them that it needs replacing. I cannot force them to do it because I said "if required" and they didn't think it was required. we cannot argue opinions - we need proof and hard facts, which is what I want to show them next weekend.