We have an RV10 with a 5800T and a 4500. Each screen independently displays AHRS and air data based upon setup guidance from support earlier this year. This redundancy is nice; however, we are experiencing an issue with the 2 screens disagreeing. Frequently during flight, mostly during roll attitude changes, we are seeing AHRS mismatch messages on both screens. Generally, the 5800 is telling the truth, but not always. The condition corrects itself in 20 to 30 seconds, but that can be bad news in IMC. The difference can be as much as 15 degrees in roll. Where do we start on diagnosing this problem?

The second question concerns the transponder. We updated to 12.08.04 and we are now seeing a Transponder Upgrade Available message. We updated the SV network after the update to get rid of the error, but cant figure out how to shake the transponder message. Is this a software update that came with the OS or is this something we download separately? Are there instructions available on how to load it?

Thank you in advance!
Russ