FWIW I found that grease applied liberally here achieved a result
From this one of the many guides
http://m.my350z.com/forum/showthread.php?t=428639
This has made the noise stop for me, but as it's off you may as well get the splines greasy too. Some have reported the clicking returning, but IMHO I think that's down to your choice of grease. I used this stuff and have had a few thousand click free miles since.
http://www.amazon.co.uk/dp/B00DEWYJYO/ref=pe_385721_37038051_pe_217191_31005151_3p_M3T1_dp_1
You won't need it all, but for £7, who cares. For the costs involved, I would definitely try this before you commit to anything else your tech suggests.good luck.