We have a few of these and are trying to persuade the ECG Dept to replace all their Tracker II's with them. The only thing we have found to go wrong is case damage, a complete case can be purchased for less than £60 including the leads. I am unaware of any message comming up after a year and we have been looking after them for a few now. I have looked in the operators manual under maintenance and all they say about that is that there are no user servicable parts inside and if there is a problem contact Reynolds. I personally think that £190 is a tad expensive for what must be a visual and function check and perhaps an occational software upgrade.
