Folks, I've seen a 2011 plate E220 for a sensible price. Not inspected it yet, but look well cared for. It's on 88k miles and has 7 services recorded on the electronic record, 6 of which at a main dealer. Looks as if the previous owner was following the 15k interval and not so much the 'or 1 year' bit, which is a shame. MOT advisories are minimal, the usual tyres and pads etc. The last service invoice mentions that the rear break lines were 'slightly corroded', however. I know this is a particular weakness on the EClass. What's the likely non-dealer cost of dealing with break lines when they worsen? Anything else I could pay particular attention to?