Most boat manuals are 90% safety rules and liability disclaimers. They tend to have little or now specific info re: your boat and how it is outfitted. (There are a few exceptions, but not many.)
For the most part, useful info about a boat is found in service manuals for the engine/drive system, electronics, etc. Do you have specific questions about some aspect of your boat or how it functions? We probably can help if you do. Unfortunately, the chances of finding a manual for a 24 year old boat are not great.