It is extremely rare to find a "service" manual for a pellet stove,and anyone that posts them stands a very good chance of a huge fine. Being smaller companies,this information is copyrighted and guarded.
They have yet to make a Service manual for the P3. They last updated their (pretty handy) Pellet Service manual in 2011, and the P3 came out in 2014. Some of the details for the Mini would apply to the P3 though, and the details on checking the ignitor resistance for example, will cross-apply.
But as far as documents specifically listing the P#, all there is is the User/Install manual.