Chris, John, Thank you for your help. My original thought was that there mignt be an error in the documentation but I haven't found anything to substantiate this.
ITAR prevents me from submitting the code.
My scope has I2C bus analysis capability and it reports the timing and signal conditions are fine. In researching this, I did notice that the TMP006 DRDY line in my design was left floating. I found in the documentation that this pin should be pulled high. Could this prevent the part from responding with real data?
The TMP006 was IR flow soldered by a pick&place assembly house. I have several boards which all show the same symptoms.