PbCoO3 used to be the “missing link” in the PbMO3 perovskite series. PbCoO3 was recently synthesized by the Azuma group using high-pressure synthesis at 12 GPa. NPD at JPARC shows that it has the exciting and unexpected valence distribution of Pb2+Pb4+3Co2+2Co3+2O12 where Pb in the A-site and Co in the B-site of perovskite ABO3 both have charge ordering leading to the so-called A-site ordered double perovskite structure. The complex Pb2+0.25Pb4+0.75Co2+0.5Co3+0.5O3 valence distribution is expected to change with perturbations such as pressure and chemical modifications. A preliminary high pressure SXRD experiment found a 0.5 % volume drop at 5 GPa. We think that this corresponds to a Pb-Co charge transfer, but it needs to be confirmed by NPD. We request 3 days on PEARL for an initial room temperature experiment from near ambient up to 10 GPa pressure.