last night after a short run when i came off plane a solid horn came on, shut off engine waited 20 seconds restarted ran fine 10 seconds later horn sounds again, did this several times same thing,top light on the diagnostic gauge stays on i think that it is something to do with the oil pump, i would be very grateful for any help trouble shooting my problem,over 2500 hrs all original power head e225dhlsoc ser 05115862 best motor i will ever own