Now here's a little thinky that popped up on advisories last year and it relates to brake pipework not available to check. Now don't know if I've got the original pipes or what but my pipes are enclosed by spring work near the hubs and as you can realise the pipes could be rotten to hell within that spring and tester can't check on that. So they have been advised to be renewed.
But to alleviate the renewal and to show the pipes are ok I've managed to get the spring work off with snipers and finger work to unwind it from pipe. Not an easy job as these springs are, well, spring steel, just a tad rusty.
See pipe with spring on it at back of where bump stop was and other pic of unwound springs. They are one piece mind you and not in bits.

 

My goodness, your inspectors are rather picky as those "spring windings" are FACTORY equipment. IF you had a seeping "pipe"(brake line) it would still show and leak between the coils due to gravity and hydraulic pressure when brakes are applied. They are there from factory to PROTECT the lines in areas of possible road debris damage and possible rub areas if slightly misrouted.