I have a 2006 Optimax and yesterday after a pretty long run the warning horn went off after I came off of pad to an idle. The horn never went off while I was running. It was constant but after I killed the engine and started it back up it went off. The water pressure was great the whole run. The oil reservoir was 2/3 full and I checked the one under the cowling when I got off the lake. The engine ran like normal the entire time no issues. Just wanted to see if it was something easy before i took it in. Any thoughts?