Update on the "noise". I took Friday off and thought I should check to see if the noise would occur again. Of course it didn't and seven loads later, still silent. The repairman arrived at 1pm and the machine behaved perfectly - purred like a contented kitten. While he couldn't actually see anything wrong, he considered it could probably be the idler pulley but the intermittent nature made it inconclusive. So he suggested I continue to listen and call again if it started up. He did charge me for the visit but would apply that toward any future repair.
Fast forward to Sunday, post beach. I was doing a few consecutive loads of beach towels, kitchen cloths, etc.. and now we get the noise during agitation. Again intermittent, but this time, I considered the fact that with something like this, why not video it with an ipad or my phone? How could I not have considered this before???? After I finished lambasting myself for being such a chump, that is what I did - broke out the trusty ipad and taped away. The noise is gone now but I expect it is only a matter of time. Now I am ready, just want to capture that noise during spin...