Help with No Oil Light & Buzzer

[allenneal]

I have a 2007 200 Etec HO and the no oil light and buzzer keeps going off. I had run it down the lake and after I stopped and started idling the no oil light and buzzer came on. I shut it down and and restarted it, no light until I idled it up. I put it back up on pad and it ran fine and the light went out. I stopped and started idling again and no light until I idled it back up. I took it to dealer, he checked it and said that he couldn't fine anything and it didn't show any engine faults. He said that it was the system check gauges bad. I replaced the gauge started it up and let it idle for a few minutes, no lights came on until I idled it up and the no oil light and buzzer came on. And suggestions? Could be a air leak, bad pump or something else?

[SEAHORSE]

what is the model and serial number?

[allenneal]

Model is E200DHLSUA, serial number 05171468.