I have a 2008 Hino 338 that we recently purchased and converted to a dump truck. It showed up to us with a P2002 and we have with thru the DPF system and replaced all the sensors and installed a new filter. It also in setting a P0087 code. I have went thru and blew out the fuel lines and replaced the SCV when it ohmed out of specs. I am at a loss for what next. When connected to the DX2 software, the common rail pressure stays on target until it gets to about 90 MPa then starts to tail off, eventually dropping to around 20 MPa at full throttle. Any help would be appreciated.