Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
Mentioned: 3 Post(s)
Quoted: 32 Post(s)
Was this "lots of work" with the 2003 E320CDI from the coolant leaking from the radiator to the tranny? That should concern only cars built before 9/2003 with a certain radiator make.
Not sure about the circuit board issue but there was an issue with a connector and its seals. Was an annoying oil leak but nothing serious and easy to fix. If it existed on this 2007 (built) car, it would have been fixed already. Anyway the two cars have a different tranny.
You should not need to worry about "known issues", just check that it is generally OK as if you were buying any other car and go for it.