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You can test them (even when still installed on the conductor plate) for their resistance.
The three shift solenoids should be 2.5-6.5 ohms, ideally around 4, and ideally all three close to each other.
The two shift pressure solenoids should also be between 2.5-6.5, ideally around 5 and, again, ideally close to each other.
The PWM solenoid should be 2.0-4.0, ideally around 3.0
Just did this two days ago when I replaced my conductor plate (r170 SLK23) because of a cracking speed sensor.
Don't forget to change out the adapter plug, as well, and make sure everything is thoroughly clean (contacts, connectors, the two screens under the shift pressure solenoids - just pull out and lightly clean). Then put in 4.5 qts to get pretty close to correct level.
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1976 240D [W115.117/616.916] (acq 11Jun76)
1990 MB 300D 2.5 Turbo [W124.128/602.962] (acq 4Sep15)
1991 SL250D (ex-300SL-24) [R129.061/OM602.962/722.618, was M104.981] (acq 25May12, converted to diesel)
1993 Jeep Cherokee [XJ] (acq 12Apr14)
2013 GLK250 BlueTec 4MATIC [X204.904/651.912] (acq 24Jan26)
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