So by some miracle or collection of miracles paragon number two is finally tuning through the bands completely without a PLL unlock message.
It has truly been a battle from a 50,000 foot global view.
There was a bad phase lock loop chip on the major loop board which would cause unlock.
In the meantime there were also problems on the minor loop board and if either the major board or the minor loop board are having PLL lock issues then the out of lock message will appear.
Of course, the way to remedy the situation is to put oscilloscope on pin 7 of the phase lock loop chip and look for a signal which is varying and not a 5 V steady signal adjust the VCO for lock which will be a steady 5 V signal and if you see a signal which looks like sign waves or such that means you’re unlocked.
If you see a signal at 0 V and its flatlined that probably means the VCO oscillator is not oscillating whatsoever.
So parts replaced on the major loop board would be the phase lock loop chip parts replaced on the minor loop board are the U1 PLL and the chip U2. The first chip is the phase lock loop chip. The second chip is a companion modulo chip an 8 pin chip which extends the accuracy of the phase lock loop. This is U2. ( no not the band)
I put both those chips into sockets.
I could not be sure there was not a short under the VCO metal cage,
I tried to remove the metal cage several times and was unsuccessful and ended up making a mess.
The third time I tried to remove the metal cage I ended up bending a corner of the metal cage inward toward the circuitry and I caused a direct short on the dreq control voltage line that is driven by the charge pump and the VCO would not change frequency.
I had not noticed this mistake for a few days.
At any rate repairing the short replacing the phase lock loop chip again with a second new one and replacing the U2 modulo chip seems to have been a successful win and I was able to get PLL lock on the full 50KHZ range which the minor loop board covers.
The minor loop board VCO raw frequency is 120 MHz to 130 MHz. There is a very complicated frequency, mixing and translation phase between the minor loop board and the reference board which is mind blowing.
take a look at the documentation.
Considering all the frequency mixing and translation it is a small miracle this three board phase lock Loop system works at all.
This is a testament to the very smart engineers in Tennessee from Ten Tec back in the 1980s time frame, back in the day.
Perhaps someday I will meet or figure out the person who designed the paragon phase lock loop  for Ten Tec Paragon I