Still suffering from a power supply issue!
I have been tracking the issues I'm having with the RF AM detector board.
I found that the -5V test point did not show -5V but ~+5V! It seemed that this pin was not connected to -5V but was passive.
I removed the RF AM detector board and exposed the power board again. Pin 11 of P3 interboard connector indeed was not connected to TP12 (-5V). What the hell?
As seen in the attached photo, the PCB pattern for the Pin 11 is missing at the label "!?" and not driven. I soldered a piece of wire there and now Pin11 is at -5V.
This fix actually changed several things. Now the bias setting by the rotary switches works.
This allows me to elliminate the saturation of MON1 of the first RF AM detector. I can go ahead to the next step for the first channel.
Now the bias feedback of the second detector is also behaving better. Now TP2 is railing.
Still MON2 is saturated. So, the behavior of the peak detectors needs to be reviewed.