I was wondering if there is any colour calibration options to set beyond the basic settings given in the TV's menu. It is my understanding that there are more advanced options that are somehow enabled and accessed by trained service people.

How do you access these settings and is it worth the trouble?

There is a service menu in all HDTVs, but it's best left to professionals. The following two posts should help you with some information:

http://www.digitalhome.ca/forum/showthread.php?t=17713

http://www.digitalhome.ca/forum/showthread.php?t=43201