Here are the PDF's about the DTC that are you telling, maybe you find there something useful
Both DTC's are about transmission fluid pressure, so probably you are right, may you have issues with transmission oil pump! which is common issue. Before getting to deep in the above PDF's, try the oil pump Active Test in Techstream, 500rpm and 1000rpm test, while you doing the test, check the Data List, there are two parameters and is "OPM Target Revolution" and the other is "OPM Revolution" they should show almost the same values.
Here are another PDF(HYBRID TRANSMISSION SYSTEM > ON-VEHICLE INSPECTION) that saying about the Active Test