We also have a P280. Some things to look at. Is the tail jet still pointing straight back? Are ALL of the wheels being driven by water pressure? Is the feed hose starting to get stiff? You might be ready for a a tuneup kit or a rebuild kit. Both have different parts in them. You might also be ready for a new feed hose. In the Texas sun, we can only get about 3 years out of a hose before it starts getting stiff.