The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!
I got one many years ago, but I was never in deep need for a service manual. Since I had no use for it as a marine radio, I did some modification; if I recall right, it can go from 149 to 168 Mc using diode matrix. What is your problem? I could possibly have a solution for you.
There are a number of service manuals for sale on eBay. It is a 3" ring binder that covers all Triton VHF radios except for the Nautilus Radio. I think the going price is around $25. There were about 500 copies printed.