LT Pack OFF the RT Pack was 25psi (should be 27-33psi) Resolution: Discrepancy: 8.13 Squawk from flight test - while climbing through FL 430 with RT Pack OFF the LT Pack was 23psi (should be 27-33psi) Resolution: Discrepancy: 8.14 Squawk from flight test - One O2 mask in LAV and LT and RT AFT rear