Ok guys.. Have a 2017 Mercruser 4.5 250 horse Bravo 3. Showing low block pressure alarm occasionally after a long run. Temp never gets above 149. It starts out with good block pressure at 18 to 20 as the day goes it may drop to 7 or 5 psi. at the same rpm. Always shows 2 to 3 psi at idle. Sometimes it alarms and goes into guradian mode. No showing any code checked by dealer. Is my boat haunted. Driving me crazy. Oh and it only has 50 hours on engine. Thanks Guys [email protected]