I would start with a software upgrade as it can work wonders on older machines. Other than that, you might send it into the service center for evaluation whenever the boat has a few weeks of down time for something else.
It is a dealer upgradable unit in regards to software or it can be sent to the service center. There is no user friendly or available end user software. While service manuals are only available to qualified dealer, this product has no service manual written to offer to anyone.