Service Advice? E320 CDI
 

Hi-I just purchased a 2006 E320 CDI Diesel sedan in Denver. The last service records that came with the car show it was lastserviced at the dealer at 39k-now has 66k on it. Car drives beautifully and I'm enjoying it. My concern is the Transmission service-I have no indication it's been done.
Should I be concerned? Should I have the dealer do a full flush and all new fluid?
I aprreciate any assistance and suggestions-thank you! I'm in Orange County, CA.