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P5VS4& PP54_S4 has no shorts to ground when multimeter on diode setting
P3V3S5 components are shorted to ground when multimeter on diode setting
That is to say all pin on the left of the IC on the schematic is shorted but everything to the right except Vin is not shorted.
I have have the exact same issue like you have pp3v3_s5 short.
Pin 1-3, 8-9, 11,13-14,18,23,25-28 =0V
Pin 4-5 = 4.96V
Pin 6-7, 24 = 0.4V
Pin 10 =0.146V
Pin 12 = 3.85V
Pin 15= 4.6
Pin 17= 11.8
Pin 21 = 4.63