Have some cooling issues after running 4-5 hours yesterday. Have a ‘04 Optimax 175hp serial# OT922039 on a Sea Pro 206CC. Heard a 2-3 beep alarm running off plan around 2200 rpm and saw 167degree in 68degree water. Slowed down and temp dropped to around 130, took it up on plane to around 3800 rpm and came down to 115degrees. Did the same thing about an hour later basically at trolling speed around 2400 and hit 171degrees, came back down on plane to 121. I need the correct service Manual for my year of engine so I can replace water pump and check on the thermostats. Been lurking here for a couple months since buying the boat, a lot of great info here and thanks for any help.