My magnum graco xr5 might finally be giving up on me. I've had it for about 2 years now, made a few thousand already off my $400 machine. The other day I used it for about 30-40 minutes,then took a break for a few. When I was to resume spraying,nothing came out of the gun.Tip wasn't clogged.I primed sprayer then got it to start spraying for less than a minute. When i release the trigger and then press trigger to resume spraying, nothing comes out of gun.I stopped for the day then the folowing day tried sprayer and same problem occured. It seems to be a pressure problem,or maybe motors shot. A partner of mine said it was the pump packings. Anybody can help please!! Any info would be greatly appreciated.THANKS.