Shandy welcome aboard.
Idon't know this boat so I cannot give exact details. Waste hoses are not just clamped but also have a sealer therefore you need to use a toll (small screw flatblade diver) to work in the joit to break the seal. Be careful not to apply too much pressure and break the plastic fitting the hose is on.
Pictures would help understand what you are looking at.
1997 2400 SCR
5.7 Vortec / Bravo 2