Today it was towed to the shop:
Ran fine all weekend. Went to start it this morning and it sounded like something came loose while it was cranking. Tried again and no start. Tried again and it started but was making a god awful racket under the hood (sounded like a diesel) but no CEL. 96k on the odo with all the regular service. Thankfully we still have 4k on the extended and I'm in a loaner (2012 Passat...nice car). Hopefully it is something easy.