RSS Ignition coil - how do I test?

[spyderchris-nz]

We have a 2013 RSS (2012 build) that ran fine last Thursday, go to fire it up on Friday morning, starts, but sounds like only 1 cyl is working, engine check light on. Had to go away on the weekend so left it until today. Pulled up code P0351, ign coil short A which means for the front cyl or fuse which is ok. checked the lead, appears to be no continuity, getting 2.4k on the rear one. OK, may have a faulty lead, didnt get spark at the plug either, but to be certain how do I check the wiring for the coil or the coil itself? Would a faulty lead bring up a code? The plug itself looks OK, new around 13000 ks ago. If there was no spark at all I'd expect it to be wet. Am I on the right track if I just replace the lead? Thanks for any input.