It depends how you are used to repair, I with an RF probe or better an RF milli-voltmeter I manage.
It is as simple as measuring the RF input voltage of a stage and the output to know if it is amplifying or not.
The probe can be manufactured by you, I share an image of how it would be and connect it to a multimeter that if it is an old needle of 20K or more, the better.
The diodes can be those or any suitable for RF (not a common rectifier) and that supports the maximum voltages to be measured.
Regards.
Ric.

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In a digital multimeter you should pay attention to the variation of the digits if it is up or down when measuring, with a needle, you can see if the signal is smaller or larger.
I have no idea how much the entrance or exit is while the entrance is less than the exit several times, the stage is going.
You must make a database of equipment vs. your probe / multimeter and then you will know how much it should have. As I do not know what you are going to use in making it is impossible to know without guessing.
If you want clarifications, you buy a commercial RF Voltmeter something like this would be nice
http://www.boonton.com/products/rf-volt-meters/9240-rf-voltmeter and you look at the service manual of each equipment and It is usually indicated in the RF voltages at the input and output.
You can also make a database when you receive a good measuring and scoring equipment and then compare when you receive one that fails. The current APs have no more than 2 or 3 steps, so there are at most 6 measurements per device.
Luck.
Ric.