Thanks to Ben and the automotive technician - Joel? - Sorry; I am terrible with names ;-(, we were able to find a noise that showed up after service. That noise was actually the result of the car wash loosening the roof rack rails and causing a strange vibration and rattling when hitting bumps. Since it occurred right after replacement of the rear springs and shocks, I assumed it was something related to the service performed. Thankfully it was an easy fix and totally unrelated to the work performed. Thanks for taking the time to help resolve this issue!