I want to try something now...tonight, I am going to start the engine when it is cold but shut if off quickly. This should pressurize the rail but not create much heat. Then check the rail pressure and temps in MB 004 and 230 and again in the morning. I would expect the rail pressure would be higher in the morning than when it is shut off hot. The hpfp outlet valve, the FPRV, and the injectors should contain the pressure resulting in a higher residual pressure in the morning...ambient temp will show fluctuations in the morning pressure of course. If you feel like doing the same...much appreciated.