You will only be able to see that info inside the PCB, but your REV only has one PA, it's 5003.
Missing / wrong info:
A1/A2: (BCM 4708)
PA: P100 (First HW Revision)
CPU: 800 MHZ
B1/B2/V2/P: (BCM 4709)
PA: 5003
CPU: 1 GHZ
PA: 5023
CPU: 1 GHZ
PA: 85402
CPU: 1 GHZ
C1: (BCM 4709C0)
PA: 5003
CPU: 1 GHZ
RT-AC1900/P: (BCM 4709C0)
PA: 5003 V2
CPU: 1.4 GHZ
Missing / wrong info:
A1/A2: (BCM 4708)
PA: P100 (First HW Revision)
CPU: 800 MHZ
B1/B2/V2/P: (BCM 4709)
PA: 5003
CPU: 1 GHZ
PA: 5023
CPU: 1 GHZ
PA: 85402
CPU: 1 GHZ
C1: (BCM 4709C0)
PA: 5003
CPU: 1 GHZ
RT-AC1900/P: (BCM 4709C0)
PA: 5003 V2
CPU: 1.4 GHZ