I had serviced for spring about 3 weeks ago they diagnosed and changed oil. I took out for 1st time ever and it started right up and ran fine until I hit about 4800 rpm and then I got the 6 beep warning. If I stay low rpm you would never know anything was wrong. It happened about 7. I checked oil level and changed in line fuel filter. Anyone have any ideas what it could be? And how to check other than taking to mechanic

