Do you have a scope?
If yes, can you input a 10MHz signal between -20dBm and 0dBm (such that it is well visible on your scope), you can use the tinySA to generate such a signal?
Remove carefully the cover close to the RF connector
Switch on the tinySA Ultra in default settings (0-800MHz) and measure the signal level at C58 and C24. (either side of the capacitor is OK)
The levels should be fairly close.
If not, the input switch is not working correctly
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For more info on the tinySA go to https://tinysa.org/wiki/
