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I haven't removed my head but I don't understand why the manual insists on that. If the liners did lift when you removed the head then it would be necessary to re-seal them obviously.
My opinion is remove the cylinder head and then put a steel straight edge across the the liners and check that they are all level with the top of the cyl block. If they are, then they haven't broken their seal.
The liners are wet-liners so if they are not sealed to the cyl block you get coolant water in the crankcase. I think Triumph are playing safe here and shouldn't be criticised for that.
That's what I would do.
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