I have a 2002 E320 and the digital clock and transmission gear indicator is garbled. Is this a case of a $2 chip which requires a $500 repair to replace, or is it something I can replace myself without great difficulty? I'm adept at such things but don't wish to spend a huge amount of time in the process. I'm a new user so please excuse if this has been asked already. A search didn't come up with an answer for me.