2016 Volvo Penta duo prop buzzer and triangle

Hello all. A friend of mine passed away in March who owned a 2015 Regal 32 bow rider with twin 300HP Volvo Penta dual props with 108 Hrs. His wife asked me to help her move the boat from the ramp over to their club today. The storing dealer dropped the boat into the water and I started my journey. As soon as I cleared the mouth of the Huron River and ran it up to 3000 RPMs, I got a buzz and a triangle with an ! In the middle on the top Volvo Penta display. The short buzzer went off about every 15 or 20 seconds. I finally hit the OK button on the digital readout and the buzzing stopped but then a fault message appeared above the OK button. The boat seemed to run fine. I didn’t notice any loss of power or any issues going on. Anybody have any ideas on this one? Would greatly appreciate any help or advice. Thank you in advance.