Colin,
Glad to help! WE really should be thanking Steve though, for he's taught me everything I know on this matter!
I have a few codes too...
They are:

#20: Evaporator temp sensor (B10/6) short circuit - with a footnote - intermittent Code 19 is continuous

#60: A/C compressor electromagnetic clutch (A9k1) - also footnote - intermittent

#80: Switchover valve block (Y11/3), tempering flap - also footnoted - intermittent

#82: Switchover valve block (Y11/3), tempering flap short or open circuit - intermittent


Steve gave me the meanings to all of these. I am not really sure of what exactly they mean. But I do notive how the word INTERMITTENT comes up at the end of every explanation, thus leading me to believe that they were random problems that did not occur over and over again. I have since deleted the codes and I'm going to see if any ot them come back.

Sorry, back to your problem, your car is now 4 years old... I wouldn't worry about 12 codes in the system, the likelihood is that they were one or two times recurring. Maybe just random problems, most of them anyway. Though I could be wrong. Now that you have the codes, try deleting all of them and then see which ones recur. I believe doing this will help us narrow down your current problem. Good luck and keep us posted!
And as always, thanks again Steve, you've been so good to all of us. We all appreciate it very much.

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)