Here is the list of 3 beep codes, and with it idling rough might be the TPS

needs to put up his engine serial number first and foremost. earlier 525 are not set up like the later ones. And depending on engine serial number -- they can have voltage issues. I am coming up with a fix for that end VERY SOON.

it is wise to have scan reports to compare every year - year after year. Matter of fact 2 scans a year is good to have ---the reports can be logged to catch issue(s) before they become bigger issues - (comparing reports can help for that ).

A great example just for one parameter to keep eyes on is water pressure readings to compare from beginning boating season to say mid season . I Print all scan reports and keep them on file for everyone that boats that are in my hands. And of course I charge for the scan..

I'm putting chips on Red and a bad water pressure sensor .

Ok that is because we just had that sensor go bad.

No rough idle. Just beep and guardian mode over 3500 rpms.

I'm going w/ cam sensor.

I hear you if it was moved and or installed by whomever as per the issue(s) plus warning horn was right after that.

A scan of the engine is needed here.