How well do you trust the reticular graph scale of your scope?
Per your Sams, we know we already have limits on the possible levels the scopes probe could have.
No more than power supply, and no less than 1 V - per the PLL to Varactor voltage - per your Service Manual channel you test on - be it Channel 1, 40 or the Mid-band 20.
As a good rule of thumb, I set my scale to Volts, multiplier 10 - gives you 10V starting range - which you can back off until you see a waveform you can use for tuning.
On most (to me IMHO) Test points for Signal - there is also the issue of "offset" which if you want AC only - just remember to set Scope accordingly. For if you don't - your signal may drift or skew upwards and you have to recenter the gun (older CRT ray-trace) or make sure the input is AC only after you lost the waveform if you are trying to get PLL to lock in.. Don't always presume the Probe is insulated tip from DC - unless you are using it for RF only (True RF probe) - then the AC value will pass but should keep DC at bay - even then - loading may be an issue so be prepared for it.
Another aspect people don't always recognize is the errors you get in assembly - this isn't from you, not the customer even - it's from the factory.
I'm sure as you look around the board, some TP are the raised ends of resistor legs of the "Stand up" and they are silkscreened.
In rare cases, but it does happen, you can scope the TP (like TP3) and get some offset voltage problems because you set your test probe on the resistor - but the resistor is INSERTED/INSTALLED the wrong way. Check the radios' silkscreen too, for the proper orientation of the Resistor - if you test the wrong side of the lead thinking you are at the right Test Point, you may be there - but the Test point Resistor or cap - you're testing, you inadvertently are probing the wrong leg and now you have different results than what you expected - either by loading effects or by voltage presence affecting the readings.
You bring up a good point and more than once I've been stung by someone or factory - making changes to cover up a fix, or carelessness from a previous repair - and they put a resistor oriented in reverse than what it should be..