I've attached a slightly sharper image of the V-525 control panel. It’s a bit easier to read the legends.
Do please also ensure that the Volts/Div (Ch1) and Time/Div controls are adjusted in accordance with the settings circled in the attachments to post #95.
If it’s easier you can take the readings off the PET’s main board as you did previously. Once we’ve confirmed that the PET itself is generating the correct signals you can think about how you want to take readings from the monitor’s board.
Alan