OK - turns out there is a bit more to this story. On a whim I grabbed another "new", blank PCB and fired up my fancy pants, supa-dupa, ULTRA closeup magnifying camera.
Well well well, looky what we have here in EXACTLY the same place on the track as the "repaired" board. With a meter it actually shows continuity but it would be destined to cause trouble down the track (pun intended) somewhere! This picture taken with the fancy camera.
Lucky I only had a small test batch of these run BUT it shows just how easy it can be to get caught out with a fairly complex board like this one despite the Homepin boys making all tracks several times wider than the originals as shown here: (if you look very closely you can just make out the break below the "5")
