>I think the above just implies that a method in the service threw an exception. There's probably more info in the InnerException if you can get it.

I cannot access the InnerException as this one bypassed my error handler which explains why it falls into the Event Viewer. This is not reproducable. It happened once and once I restarted the service, it went ok and processed the same record it failed on previously. So, for now, it is still running in service mode but will fail again until I find what is in cause.

If it would have failed again when I restarted the service, I would have been able to trace more into it until I find the exact line which triggered it. But, as surprise as it got, just restarting the service made it processing that record ok.